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Eberhard-Karls-Universität Tübingen, Botanisches Institut, Spezielle Botanik und Mykologie, Auf der Morgenstelle 1, 72076 Tübingen, Germany
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ABSTRACT |
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 TOP ABSTRACT INTRODUCTIONMATERIALS AND METHODSTAXONOMYLITERATURE CITED |
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A contribution is made to the rust fungus flora of Argentina: Puccinia baccharidis-boliviensis, P. cordyceps, P. pucarae, and Aecidium hypseocharidicola are described as new species. Cionothrix praelonga, Frommeëlla mexicana var. mexicana, Phakopsora compressa, Prospodium peruvianum, Puccinia amphiospora, P. chaetochloae, P. liabi, P. pappophori, P. sanguinolenta, P. subaquila, Ravenelia havanensis, Uredo leonuri, Uromyces orbicularis, and U. cnidoscoli are new reports for Argentina. New observations on already known species were made: the aecia of Puccinia subaquila and aecia and uredinia of Uromyces cnidoscoli are described for the first time. Senecio hieronymi is a new host for Puccinia lagenophorae. Uredo leonuri belongs to the genus Coleosporium. Melilotus albus is a new host of Uromyces anthyllidis in Argentina.
Key words: Cionothrix, Frommeëlla, Prospodium, Puccinia, Ravenelia, Uromyces
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INTRODUCTION |
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TOPABSTRACTINTRODUCTIONMATERIALS AND METHODSTAXONOMYLITERATURE CITED |
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) and discovered and described also many rust fungi. The work on rust fungi was continued by Lindquist who compiled the knowledge in a comprehensive flora (Lindquist 1982
). This flora is still the most important reference for the entire area. The present paper intends to contribute to the rust flora of the north-western Argentine provinces Salta and Jujuy. Among the collections made on a three-week field trip in March 2000 there were four specimens that proved to represent new species, and several which were new reports for Argentina. Additionally, some collections allowed new observations on already known species.
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MATERIALS AND METHODS |
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TOPABSTRACTINTRODUCTIONMATERIALS AND METHODSTAXONOMYLITERATURE CITED |
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.
For the descriptions of rust fungi spore stages were designated according to their morphology and not to their position in the life cycle (comp. Laundon 1967
).
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TAXONOMY |
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TOPABSTRACTINTRODUCTIONMATERIALS AND METHODSTAXONOMYLITERATURE CITED |
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Spermogonia non visa. Uredinia absentia. Aecia caeomatoidea (sine peridio), longitudinalia, usque ad 11 x 1.5 mm, sparse secundum caules et ramulos disposita, profunde immersa, sub cortice primo nascentia, telis hiantibus hospitis circumdata, pulverulenta, lucente citrina ad aurea, stucturae steriles absentes. Aeciosporae catenulatae, formae irregularis pressu mutuo in soro, praecipue ellipsoideae, late ellipsoideae vel rarius fusiformes, nonnumquam subapiculatae, (29) 31–36.5–42 (46) x 19–21.9–23 (25) µm, pariete hyalino, 1–1.5 µm crasso (ornamentum inclausum), subtilissime denseque et homogeniter verruculoso, pori germinationis non visi. Telia foliicola, abaxialia vel rarius adaxialia, obscure aurantiaca ad crocea, pulvinata, plus minusve rotundata, usque ad 1 mm diametrum. Teliosporae bicellulosae, rarissime tri- vel unicellulosae, praecipue ellipsoideae ad anguste ellipsoideae, medio leniter vel vix constrictae, apice obtuso, rarius prope truncato, basaliter cuneatae, (46) 50–61.6–75 (81) x 19–22.9–26 µm, pariete levi, subhyalino vel dilutissime brunneo, lateraliter ca 1.5 µm crasso, apicaliter usque ad 5–9 µm, pedicellis 1.5–2plo longiori teliosporis, membrana leviter incrassata et hyalina, germinatione teliosporae maturitatem subsequenti. Basidiosporae globosae vel subglobosae, apiculo brevissimo lateque praeditae.
In foliis, caulibus ramulisque Baccharidis boliviensis (Asteraceae), arbustum typicum praepunae argentinensis et boliviensis.
Spermogonia not seen. Uredinia lacking. Aecia caeomatoid (without peridium), forming longitudinally oriented sori on branches and stems, up to 11 x 1.5 mm, surrounded by the torn and gaping overlaying host tissues, deep-seated, originating below the primary cortex, pulverulent, bright lemon yellow to golden yellow, sterile structures lacking. Aeciospores catenulate, irregularly shaped by mutual pressure within the sorus, mostly ellipsoidal, broadly ellipsoidal or more rarely fusiform, sometimes almost apiculate, (29) 31–36.5–42 (46) x 19–21.9–23 (25) µm, spore wall hyaline, 1–1.5 µm thick (including ornament), very finely and densely homogeneously verruculose, germ pores not seen. Telia abaxially or more rarely adaxially on the leaves, dull orange to saffron-colored, pulvinate, more or less rounded, up to 1 mm in diameter. Teliospores bicellular (one- or three-celled spores very rare), mostly ellipsoidal to narrowly ellipsoidal, slightly contracted at the septum, spore apex obtuse, more rarely almost truncate, spore base cuneate, (46) 50–61.6–75 (81) x 19–22.9–26 µm, spore wall smooth, subhyaline or very faintly brown, laterally ca 1.5 µm thick, apically thickened to 5–9 µm, spore pedicels 1.5–2 times as long as the spores, with slightly thickened hyaline walls, teliospores germinating upon maturity. Basidiospores globose or subglobose with a very short broad apiculus.
On leaves, stems, and branches of Baccharis boliviensis (Asteraceae), a typical shrublet of the Argentine and Bolivian praepuna.
Province Jujui: Quebrada de Humahuaca, at the road between Humahuaca and Abra Pampa near Azul Pampa, on Baccharis boliviensis (Wedd.) Cabrera. 10 Mar 2000, leg. R. Berndt & V. Faust-Berndt. HOLOTYPE deposited in LPS, ISOYPES in M, PUR and the author's herbarium (HeRB 5763).
Other material studied: Puccinia consulta Jackson & Holway PUR F8175 (Type!).
Puccinia baccharidis-boliviensis is similar to P. praeculta Jackson & Holway and especially P. consulta. As P. baccharidis-boliviensis both are opsis-forms (possessing spore states (0), I, III) with caeomatoid aecia (i.e., with catenulate spores and without peridium) and apically thickened teliospores. Puccinia praeculta has smaller teliospores (40–54 x 22–30 µm according to Lindquist (1958)
, 40–50 x 21–27 µm after Jackson (1932)
) and aeciospores with coarse longitudinal ridges or longitudinally elongated warts. Puccinia consulta is very similar to the present species. It differs mainly by slightly smaller and broader teliospores (Fig. 4
), the light brown color of the telia and teliospore wall and by aeciospores with rather long and more conspicuous warts that are more irregularly situated and tend to be confluent. All collections of P. consulta cited by Jackson (1932)
and Lindquist (1958)
are from SE Brazil on Baccharis species wholly different from B. boliviensis.
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Etymology – Named after the stalked mesospores whose shape resembles the fruiting bodies of the ascomycete genus Cordyceps.
Spermogonia, aecia et uredinia absentia. Telia foliicola, abaxialia, laxe sparsa, pulvinata, plus minusve rotundata, usque ad 0.7 mm diametrum, primum ochracea, mature straminea vel eburnea. Teliosporae plerumque unicellulares (mesosporae), anguste ellipsoideae vel anguste obovoideae, 29–34.8–43 (48) x 12.5–14–17 µm, pariete hyalino vel subhyalino, lateraliter ca 2 µm, apicaliter usque ad 4–6 µm crasso, pedicellis longis, pariete hyalino et leniter incrassato praeditae. Teliosporae bicellulosae rarae et sparsae, mesosporis similes.
In foliis Malvaceae indeterminatae.
Spermogonia, aecia and uredinia lacking. Telia on the abaxial leaf surface, loosely scattered, pulvinate, round, first ochraceous, at maturity lightly straw-colored or cream, up to 0.7 mm in diam. Teliospores predominantly unicellular (mesospores), narrowly ellipsoidal or narrowly obovate, 29–34.8–43(48) x 12.5–14–17 µm, with smooth hyaline to subhyline spore wall that is ca 2 µm thick laterally and thickened to 4–6 µm apically, pedicels long, with slightly thickened hyaline wall, ordinary two-celled teliospores rare or scattered, like the mesospores.
On leaves of an undetermined Malvaceae.
Province Jujuy: Libertador, at road no. 83 between S. Francisco and the "Monolith", 14 Mar 2000, leg. R. Berndt & V. Faust-Berndt. HOLOTYPE deposited in LPS, ISOYPES in M and the author's herbarium (HeRB 5773).
Additional specimens examined. Province Salta: between Salta and La Caldera, some km behind Salta, on undetermined Malvaceae, 9 Mar 2000, leg. R. Berndt & V. Faust-Berndt (HeRB 5736). Puccinia platyspora (Speg.) Jacks. & Holw. Province Salta: road 102 between Salta and Cafyate, at the turnoff to Vinaco (SE Chicoana), on undetermined Malvaceae, 18 Mar 2000, leg. R. Berndt & V. Faust-Berndt (HeRB 5810).
Puccinia cordyceps is similar to P. platyspora on Pavonia spp. by the predominance of mesospores in the telia. It differs from the latter by the (sub)hyline spore walls, ochraceous to cream-colored telia and smaller teliospores that are less thickened apically. Spegazzini (1899)
reported that the telia of P. platyspora (at that time "Uromyces platysporus") were brick-colored and that the spores measured 38–42 x 15–20 µm. The Sydows (1910)
measured 35–46 x 12–20 µm for the mesospores and stated that the telia were dark brown. According to Lindquist (1982)
, the mesospores measure 40–60 x 15–18 µm and the sori are blackish. In the present collection of P. platyspora, the telia were chestnut brown and the mesospores (Fig. 7
) measured 35–42.6–49 x 15–16.6–19 µm. In the second specimen of P. cordyceps (HeRB 5736), mesospores measured 25–35.4–38 (42) x 13–14.2–17 µm.
The predominance of mesospores or ordinary two-celled teliospores seems to be a quantitative rather than a qualitative character. One may ask, therefore, whether it makes sense to delimitate rust species with predominant mesospores from similar species that have mainly ordinary teliospores. Puccinia platyspora, for example, is very similar to P. malvacearum beside of the predominant mesospores, and the species may be closely related. The mesosporic P. cordyceps may be related as well to another ordinary spored Puccinia sp. on Malvaceae. A candidate might be P. exilis P. & H. Sydow that has yellow-brown telia and relatively small teliospores with subhyaline walls (Sydow 1904
). As P. platyspora and P. cordyceps seem to lack ordinary spores almost entirely it seems to be justified at the moment to maintain them as separate species.
Puccinia pucarae R. Berndt, sp. nov. Figs. 8, 9
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Spermogonia et aecia non visa. Uredinia foliicola, plerumque adaxialia, inter nervos foliae disposita, elliptica usque ad striiformia, pulverulenta, cinnamomea, sine paraphysibus. Urediniosporae subglobosae ad globosae, 20–22.9–25 (26) x 20–22.1–24 µm, pariete cinnamomea, delicatissime, crebre et ± homogeniter verruculoso, 1.5–2.5 (3) µm crasso, pori germinationis 4–5 (6), plerumque cum 4 poris ± aequatorialibus et uno (sub)apicali, rarius porus apicalis deest, interdum cum poris prope sparsis. Telia foliicola, rarius culmicola, plerumque adaxialia, inter nervos foliae disposita, elliptica ad elongata (usque 2 mm) vel vix confluentia, tenue pulvinata, fusco-nigra. Teliosporae plerumque late ellipsoideae, rarius late obovoideae, in septo vix constrictae, 28–31.6–36 x 23–26.1–27 (29) µm, pariete levi, vivide ferrugineo, badio apicem versus, lateraliter 2.5–3 (4) µm crasso, 6–8 µm crasso in apice, poro germinationis cellulae superi apicali, obscuro in cellula basali, pedicellis longis et proceris (usque ad 3plo longiori teliosporis), membrana leviter incrassata, subhyalina vel ochracea. Mesosporae sparsae adsunt.
In Aristida sp. (Poaceae, Aristideae).
Spermogonia and aecia not seen. Uredinia predominantly on adaxial leaf surface, more rarely caulicolous, pulverulent, elliptic to striiform, cinnamon, paraphyses not observed. Urediniospores subglobose to globose, 20–22.9–25 (26) x 20–22.1–24 µm, spore wall cinnamon brown, very finely, densely and more or less homogeneously verruculose, 1.5–2.5 (3) µm thick, germ pores (3) 4–5 (6), mostly with 4 approx equatorial germ pores and a (sub-) apical pore or more rarely with 4 equatorial germ pores, pores sometimes almost scattered. Telia predominantly on adaxial leaf surface, more rarely caulicolous, pulvinate, elliptic to elongate, hardly confluent (up to 2 mm long), blackish. Teliospores mostly broadly ellipsoid, more rarely broadly obovoid, 28–31.6–36 x 23–26.1–27 (29) µm, hardly or not constricted at the septum, spore wall smooth, vividly ferruginous, chestnut brown at the spore apex, laterally 2.5–3 (4) µm thick, apically thickened to 6–8 µm, germ pores apical in the distal, obscure in the proximal cell, pedicel thick-walled, subhyaline to ochraceous, slender and very long (up to three times as long as spores). Mesospores scattered.
On Aristida sp. (Poaceae, Aristideae).
Province Salta: road 40 between Cafayate and Tafi del Valle, at the "Ruinas de Quilmes" archeological site, trail through excavations, 20 Mar 2000, leg. R. Berndt. HOLOTYPE deposited in LPS, ISOYPES in M and the author's herbarium (HeRB 5816).
The present specimen could not be assigned to any of the known Aristida-rusts with certainty. Its teliospores (Fig. 8
) closely resemble those of Puccinia aristidae Tracy var. chaetariae Cummins & Husain, a species which is known to occur in Argentina on Aristida adscensionis L. (Cummins and Husain 1966
). The urediniospores (Fig. 9
), however, differ from the latter rust and are very similar to urediniospores of P. subnitens Dietel that occurs on Distichlis spp. (Chloridoideae, Aeluropodeae). Another similar species is Puccinia opuntiae Arthur & Holway which differs by urediniospores with 6–8 scattered germ pores, longer teliospores and the presence of numerous to abundant mesospores. The latter species occurs on Bouteloua spp. (Chloridoideae, Chlorideae) which might be confused with Aristida for their three-awned lemmata.
Aecidium hypseocharidicola R. Berndt, sp. nov. Figs. 10 , 12–14
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Spermogonia absentia. Aecia aecidioidea, foliicola, apprime abaxialia, greges parvos in areis leviter hypertrophatis, flave vel rubiter discoloratis, formantia. Aeciosporae plusminusve rotundae vel subangulares, 20.5–22.8–25 x 16.5–19.1–22 µm, pariete ca 1.5 µm crassa, homogeniter densiterque delicatissime verruculoso, peridio breviter tubuloso ad cyathiformi, cellulae peridii 26–32 x 18–25 µm, inter se proiecturis proximalibus parietis exterioris iunctae, pariete exteriori delicate denseque longitudinaliter striato, ca 7–9 µm crasso, pariete interiori verrucoso, verrucis delicate cylindricis, nonnumquam confluentibus, dense et irregulariter obsito, ca 3–4 µm crasso.
In foliis Hypseocharidis cf. tridentatae (Oxalidaceae), herba vegetationis praepunae et punae andinae.
Spermogonia not present. Aecia aecidioid, in small groups, mostly abaxially on slightly hypertrophied yellow to reddish spots of the host leaves. Aeciospores more or less round or slightly angular, 20.5–22.8–25 x 16.5–19.1–22 µm, spore wall hyaline, ca 1.5 µm thick, evenly very finely and densely verruculose. Peridium shortly tubular, peridial cells 26–32 x 18–25 µm, finely striate on their outer surface, verrucose with rather delicate, irregular and sometimes confluent warts on the inner surface, outer periclinal wall finely striate in optical section, ca 7–9 µm thick with a thorn-like proximal projection, inner periclinal wall more distantly striate, ca 3–4 µm thick.
On leaves of Hypseocharis cf. tridentata (Oxalidaceae) a herb of the andine praepuna and puna.
Province Jujuy: Abrapampa, dried up lakes and shrub semi-desert ca 1 km NW Abrapampa at the dirt road to Rinconada, alt. ca 3500m on Hypseocharis cf. tridentata Griseb. (Oxalidaceae). 10 Mar 2000, leg. V. Faust-Berndt & R. Berndt. HOLOTYPE deposited in LPS, ISOYPES in M and the author's herbarium (HeRB 5765).
Additional specimens examined. Puccinia andropogonis Schw.: USA. Arizona: Santa Cruz County: upper end of Sycamore Canyon, on Oxalis amplifolia Knuth. 12 Aug 1971, leg. G. B. Cummins (PUR 63921). USA, Arizona: Atasco Mts. W of Nogales, Piña Blanca Lake, turn-around on Red Rock picnic rd., on O. amplifolia Knuth. 16 Aug 1961, leg. G. B. Cummins (PUR S-8149). USA, Washington D.C.: on O. corniculata L. from greenhouse infection experiments, 1913, leg. W. H. Long (PUR N-620).
Puccinia sorghi Schw.: USA, Iowa: 5 miles S of Indianola, on Oxalis stricta L. 28 Apr 1925, leg. M. A. Smith (PUR 17351). USA, Indiana: Lafayette, on O. corniculata L. infected in outdoor experiments, 4 Apr 1925, leg. E. B. Mains (PUR 17352). USA, Indiana: Lafayette, on O. corniculata L. from greenhouse infection experiments, 17 Jun 1924, leg. E. B. Mains (PUR 17350).
Lindquist (1953)
reported Aecidium hypsochaeridis on "Hypsochaeris" pimpinellifolia (Oxalidaceae) from NW Argentina. As the host genus is wrongly spelt the name of the rust should be Ae. hypseocharidis. The species differs from the present one by smooth inner walls of the peridial cells. Ae. hypseocharidicola is also different from aecidial stages of the "grass-rusts" Puccinia andropogonis Schw. (anam. Aecidium pentastemonis Schw.), P. sorghi Schw. (anam. Ae. oxalidis Thümen) and P. purpurea Cooke that occur on members of the genus Oxalis. Nevertheless, the morphological similarity of the aecidia and the closely related host genera suggest that also Ae. hypseocharidicola may belong to a species of Puccinia that infects Poaceae in the dikaryotic stage. Rusted Hypseocharis was collected in a thin semi-desert vegetation on salty soils of dried up perennial Puna lakes. Predominant grasses of this environment are Aristida humilis H. B. K., A. asplundii Henrard (Chloridoideae, Aristideae), Bouteloua simplex Lag. (Chloridoideae, Chlorideae) and Microchloa indica Hackel (Chloridoideae, Chlorideae) (Ruthsatz 1977
). Thus, Aecidium hypseocharidis may be part of the life cycle of a Puccinia sp. that infects one of those grasses.
New reports for the rust flora of Argentina and new observations – Cionothrix praelonga (Winter) Arthur
Both collections were made on sterile species of Eupatorium (Asteraceae, Eupatorieae) in the subtropical Yunga-forests or secondary growth at formerly forested sites.
Frommeëlla mexicana (Mains) McCain & Hennen var. mexicana
False-strawberry rust was collected at two closely located sites on Duchesnea in the disturbed roadside vegetation within an otherwise pristine montane rainforest environment. Only in one specimen (HeRB 5790) telia were found. Teliospores measured (34) 42–54 (64) x 23–31 µm and were predominantly three-celled. The specimens were therefore assigned to F. mexicana var. mexicana. Hitherto, only F. mexicana var. indicae McCain & Hennen was reported from the Argentine provinces of Cordoba and Buenos Aires (McCain and Hennen 1990
).
Phakopsora compressa (Arthur & Holway) Buriticá & Hennen
The specimen contains uredinia and telia. The species was not cited by Lindquist (1982)
for Argentina and is thus considered a new report. Phakopsora compressa is widespread in the warm regions of the Americas on Paspalum hosts (Cummins 1971
).
Prospodium peruvianum (Sydow) Cummins
Only telia were present. Teliospores measured 32–40 x 23–27 µm, the spore wall was 2.5–3 µm thick, vividly brown, only obscurely bilaminate, with coarse, densely situated subacute warts. All specimens studied by Cummins (1940)
occurred on Lippia species (Verbenaceae). The species was not cited by Lindquist (1982)
for Argentina and is thus considered a new report.
Puccinia amphiospora Cummins
The species is characterized by the presence of ordinary and amphisporic urediniospores. It was not cited by Lindquist (1982)
for Argentina and is thus considered a new report. Cummins (1952)
considers P. amphiospora to be just an amphisporic variant of P. hyptidis-mutabilis Mayor, a species which has not been reported for Argentina either. In the present specimen only uredinia that contained ordinary and amphisporic urediniospores were present.
Puccinia chaetochloae Arthur
Both specimens had uredinia and telia. The species was not cited by Lindquist (1982)
for Argentina and is thus considered a new report.
Puccinia liabi Mayor
The species was not cited by Lindquist (1982)
for Argentina and is thus considered a new report.
Puccinia pappophori Cummins
The species was not cited by Lindquist (1982)
for Argentina and is thus considered a new report.
Puccinia sanguinolenta Hennings
P. sanguinolenta belongs to a group of some 15 Puccinia species on members of Malpighiaceae in Central and South America. Most of them have reticulate teliospore walls, some were described to have verrucose walls (that may prove to be reticulate in reality), and only one species, P. barbatula Arthur & Johnston, has smooth, hyaline-walled teliospores. These rusts deserve a thorough re-investigation as many species are very similar and may turn out to belong to a single species. The present specimen fits the descriptions of P. sanguinolenta quite well: II: 32–39 x 23–27 µm, mostly ellipsoidal, spore wall ochraceous to light brown, 2–3 µm thick, with 4(–5) longitudinal thickened bands where the spore wall is indistinctly bilaminate, apically slightly thickened to 4 µm, basally to 5 µm, moderately densely and rather prominently homogeneously echinulate, germ pores difficult to see, probably 4(–5) located ± equatorially in the longitudinal thickenings of the spore wall. III: 42–49 x 32–35 µm, spore wall chestnut brown, about 5–6 µm thick, deeply and irregularly foveolate, obscurely bilaminate, apical cell most often ochraceously acuminate, teliospore pedicel slender, 1–1.5 times as long as spores, unadorned, hyaline, only close to the spore yellowish brown.
A similar species, P. heteropteridis Thümen, was already reported for Argentina (Lindquist 1982
). Basically, this species differs from P. sanguinolenta only by urediniospores with two equatorial, opposite germ pores that are covered by hyaline papillae. It should be noted, however, that most descriptions of P. sanguinolenta state that its urediniospores also have two germ pores. León Gallegos and Cummins (1981)
were probably the first who described that four germ pores were present.
Puccinia subaquila Jackson & Holway Figs. 15–17
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Uredinia and some aecidioid aecia (i.e., more or less cup-shaped, with peridium) were present on the specimen. The urediniospores fitted very well to those of P. subaquila as described by Jackson (1932)
and Parmelee (1967)
. The spores tended to be less flattened apically than described, but this was difficult to observe as most spores were oriented top or bottom up. In top view urediniospores were globose or subglobose and measured 21–26 µm in diameter. The spore wall was ca 1.5 µm thick, homogeneously rather finely and densely echinulate and had (2) 3–4 (5) more or less equatorial germ pores. As described by Parmelee, the echinulation became more delicate towards the hilum of the spores. Two other rusts on Wedelia have similar urediniospores: Puccinia caracasana Sydow (urediniospores globose or broadly ellipsoidal with four equatorial germ pores and walls ca 1–1.5 µm thick) and Uredo vicina Arthur that has bigger, transversely ellipsoidal urediniospores with four equatorial germ pores and walls ca 1.5–2 µm thick. The species was not cited by Lindquist (1982)
for Argentina and is thus considered a new report.
The aecia present on the material probably belong to P. subaquila. Aecia of this species are reported for the first time. Because of the scarcity of the aecia the following description may be improved with better material: Aecia mostly on abaxial, more rarely on adaxial leaf surface, singly or in small groups up to three, with an ochraceous, rather long cylindrical and lacerate peridium, spore mass ochraceous to light brown, powdery, aeciospores catenulate, irregularly broadly ellipsoidal to ellipsoidal, but mostly angular (Fig. 15 ), sometimes with an elongated and thickened apex, (20) 24–30 (33) x (16) 18–23 µm, spore wall ochraceous to very light brown, 1.5–2 µm thick, thickened to 3–6 µm where elongated apices are present, densely and homogeneously rather coarsely verrucose by cylindrical warts that have an irregularly lobed outline in face view (Fig. 16 ), peridial cells thin-walled and therefore entirely compressed so that the connection between the cells could not be elucidated, with smooth external and finely and densely verrucose internal walls (Fig. 17 ).
Ravenelia havanensis Arthur
for Argentina and is thus considered a new report.
R. havanensis was described from Cuba and later reported from Costa Rica (Cummins, 1978
). The author collected it for the first time in Venezuela on Enterolobium cyclocarpum Griseb. (Guarico state, ca 23 km N Altagracia de Orituco, close to the border of Guatopo Natl. Park, 8. Dec. 1993) and now in NW Argentina.
R. havanensis is a fine example for how little is known about the distribution of tropical rusts. The first reports suggested a rather limited distribution in the Caribbean and Central America. The Venezuelan and Argentine reports show that the species has a much wider distribution and may probably be found wherever E. cyclocarpum and related Enterolobium species occur.
Uredo leonuri Speg. Fig. 18
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The only rust fungus on Leonurus which is known to the author is Uredo leonuri that was described by Spegazzini (1912)
in "Mycetes Argentinenses" as occurring on Leonurus cardiaca "in hortis Montevideo". The Sydows (1924)
did not see the specimen and repeated Spegazzini's diagnosis. They stated, however, that the type locality was Montevideo in Uruguay. Strangely, U. leonuri was not mentioned by Lindquist (1967, 1982)
as a member of the Argentine or Uruguayan rust flora. Thus, U. leonuri is considered to be a new report for Argentina.
The present collections were assigned to U. leonuri with some hesitation as the spores showed differences to Spegazzini's description. He described the urediniospores as globose (20–25 x 20 µm), verrucose, thin-walled and pedicellate ("centrales stipite hyalino (20 x 5 µm) mox fluxili suffultae"). In the present collections, urediniospores were subglobose to broadly elliptic, bigger, and measured 23–33 x 18–23 µm (HeRB 5755) and 24–33 (35) x 19–23 (25) µm (HeRB 5819). The spore wall was about 2–2.5 µm thick (including ornament) and entirely covered by densely situated, more or less cylindrical warts that had an irregular outline and were sometimes anastomosing (Fig. 18 ). The characters of the urediniospores leave no doubt that the present material is the uredinial stage a of Coleosporium species. Unfortunately, it was not possible to show convincingly that the urediniospores were produced in chains although numerous sections were made through young sori still covered by the host epidermis.
To the knowledge of the author, three species of Coleosporium were described on Lamiaceae, all of them from Asia.
Uromyces orbicularis Dietel
On both specimens aecia and telia were present. Teliospores measured 27–33 x 22–24 (26) µm in HeRB 5756, and 25–30 x 21–24 µm in HeRB 5768 and are slightly bigger than described by Dietel (1897)
. Generally, the observed characters fit Dietel's description very well and the present specimens are assigned to U. orbicularis with confidence. To the knowledge of the author this species has been reported from Brazil and Bolivia but not from Argentina, so far.
Uromyces cnidoscoli P. Hennings Figs. 11, 19–21
for Argentina and is thus considered a new report. This is an unmistakable species on account of its transversely ellipsoidal, coarsely verrucose teliospores and teliospore pedicels whose apical parts swell noticeably in fluids (Fig. 19 ). The host plant could not be determined to the species but probably belongs to sections Jussieua or Vitifoliae of Jatropha subgen. Cnidoscolus. As far as the author knows, only the teliospores of the rust have been described so far. The Argentine specimen also revealed spermogonia, aecia, and uredinia. Uromyces cnidoscoli is thus an autoecious macrocyclic species. Unfortunately, most of the aecia were old or heavily parasitised by Tuberculina sp. Therefore, the description of the aecia and aeciospores is provisional: Aecia aecidioid, in small, dense groups abaxially or adaxially on leaves, more rarely on stalks and fruit capsules, on brownish spots of the host tissue that later become necrotic, with frail white short peridium that hardly emerges from the aecidial cavity, aeciospores catenulate, broadly ellipsoidal to subglobose, often slightly angular, 23–31 x 18–24 µm, spore wall ca 1.5 µm thick, slightly or not thickened in the angles, finely verruculose by minute warts that tend to fuse to small groups (Fig. 20 ), peridial cells with smooth outer and coarsely verrucose inner walls (Fig. 21 ). Uredinia scattered on abaxial leave surface, tiny, ochraceous with a tinge of orange ("honey-coloured"), subepidermal but early naked, without sterile binding structures, pulverulent, urediniospores (Fig. 11 ) broadly ellipsoidal or obovoidal, 24–30 x 21.5–26 µm, spore wall almost hyaline, ca 1.5 µm thick, moderately densely rather delicately echinulate, echinulation on the entire spore surface but slightly irregularly, germ pores not seen. Telia predominantly scattered on the adaxial leaf surface, abaxially at least partly developing from uredinia, subepidermal but early naked, without sterile binding structures, pulverulent, blackish brown, teliospores transversely ellipsoidal, 28–34 µm diam., 28–34 x 21–25 µm in side view, spore wall deep chestnut brown, around 2–3 µm thick, coarsely verrucose-rugose with irregular blunt warts that are partly connected by ridges, ornamentation almost lacking proximally, teliospore pedicels short, hyaline, their distal parts swelling in water/lactophenol almost spherically.
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described Aecidium cnidoscoli and stated that it belonged to U. cnidoscoli "very probably". In his short description the aecidiospores were described as smooth. Ae. cnidoscoli seems to be different therefore from the aecial stage of U. cnidoscoli and is not included as a synonym here. It is interesting to note that in the present specimen several telia were also parasitised by Tuberculina, a rust myco-parasite that is normally found on aecia or other sori that occupy the aecial position (following spermogonia) in the rust life cycle.
Puccinia lagenophorae Cooke
According to Dr. M. Scholler (Arthur Herbarium, Purdue), S. hieronymi is a new host for P. lagenophorae.
Uromyces anthyllidis (Grev.) Schroeter
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ACKNOWLEDGMENTS |
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FOOTNOTES |
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*Part 190 of the series "Studies in Heterobasidiomycetous Fungi"
Accepted for publication September 8, 2001.
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LITERATURE CITED |
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TOPABSTRACTINTRODUCTIONMATERIALS AND METHODSTAXONOMYLITERATURE CITED |
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Cummins GB., 1952 Uredinales from various regions Bull Torrey Bot Club 79:212-234
Cummins GB., 1971 The rust fungi of grasses, cereals and bamboos New York: Springer-Verlag. 570 p
Cummins GB., 1978 Rust fungi on Legumes and Composites Tucson, Arizona: Univ. of Arizona Press. 424 p
Cummins GB., Husain SM., 1966 The rust fungi on the genus Aristida Bull Torrey Bot Club 93:56-67
Dietel P., 1897 Uredineae brasilienses a cl. Ule lectae Hedwigia 36:26-37
Hennings P., 1895 Fungi goyazenses Hedwigia 34:88-116
Jackson HS., 1932 The rusts of South America based on the Holway collections—VI Mycologia 24:62-186
Laundon GF., 1967 Terminology in the Rust Fungi Trans br mycol Soc 50:189-194
León Gallegos HM, Cummins GB., 1981 Uredinales (Royas) de Mexico Vol. I. Culiacán, Sinaloa, Mexico: SARH. 440 p
Lindquist JC., 1953 Notas Uredinológicas II Rev Fac Agron Univ Nacl La Plata 29:35-44
Lindquist JC., 1958 Las Royas Parásitas de «Baccharis» Rev Fac Agron Univ Nacl La Plata 34:1-79
Lindquist JC., 1967 Uredinales del Uruguay Rev Fac Agron Univ Nacl La Plata 43:187-214
Lindquist JC., 1982 Royas de la República Argentina y Zonas Limítrofes Buenos Aires, Argentina: Instituto Nacional de Tecnología Agropecuaria. Colección Científica Vol. 20. 574 p
McCain JW, Hennen JF., 1990 Taxonomic notes on Frommeëlla (Uredinales)—1 Mycotaxon 39:249-256
Nicora EG, Rúgolo de Agrasar ZE., 1987 Los Géneros de Gramíneas de America Austral Buenos Aires, Argentina: Editorial Hemisferio Sur. 611 p
Parmelee JA., 1967 The autoecious species of Puccinia on Heliantheae in North America Can J Bot 45:2267-2328
Ruthsatz B., 1977 Pflanzengesellschaften und ihre Lebensbedingungen in den Andinen Halbwüsten Nordwest-Argentiniens Dissertationes Botanicae. Vol. 39. Vaduz: J. Kramer. 168 p + 27 p
Spegazzini C., 1880–1882 Fungi Argentini Reprint 1971. Amsterdam, Holland: Linnaeus Press. 260 p
Spegazzini C., 1899 Fungi argentini novi vel critici Anal Mus Nac Buenos Aires 6:81-365
Spegazzini C., 1912 Mycetes Argentinenses Anal Mus Nac Buenos Aires 23:1-130
Sydow P., 1924 Monographia Uredinearum. Vol. IV Uredineae Imperfectae. Leipzig, Germany: Gebr. Bornträger. 671 p
Sydow P., Sydow H., 1904 Monographia Uredinearum. Vol. I Genus Puccinia. Leipzig, Germany: Gebr. Bornträger. 972 p
Sydow P., 1910 Monographia Uredinearum Vol. II. Genus Uromyces. Leipzig, Germany: Gebr. Bornträger. 396 p
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