This Article Full Text Full Text (PDF) Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Hughes, S.J. Search for Related Content PubMed Articles by Hughes, S.J. Agricola Articles by Hughes, S.J.

Heteroconium and Pirozynskiella n. gen., with comments on conidium transseptation

     Eastern Cereal and Oilseed Research Centre Research Branch, Central Experimental Farm, Agriculture and Agri-Food Canada, Ottawa, Ontario, K1A 0C6 Canada

Heteroconium citharexyli, the type species of this genus, is illustrated and redescribed as a sooty mold bearing acropetal chains of conidia showing a basifugal sequence of septation. Heteroconium neriifoliae, H. glutinosa and the Heteroconium synanamorph of Antennulariella concinna are congeneric. The latter species is neotypified, illustrated and described. Pirozynskiella new genus, typified by P. solaninum comb. nov. ( Helminthosporium solaninum), differs from Heteroconium in having an obligate association with asterinaceous fungi and in the centrifugal sequence of conidium transseptation after the initial median septum. Pirozynskiella costaricensis comb. nov. ( Dendryphion costaricensis) is illustrated and described. Heteroconium tetracoilum and H. chaetospira are fungicoles of wood and bark; the former has basifugal conidium septation and the latter has a centrifugal sequence. The two latter species can be excluded from the Heteroconium. Basifugal and centrifugal septation of conidia is discussed with reference to several sooty molds, to some foliicolous anamorphs with subcuticular hyphae (Heterosporiopsis) and to some wood and bark hyphomycetes (Septonema, Taeniolella). Ten other species included in Heteroconium are known to me only from their original descriptions; only one (H. asiaticum) is probably a sooty mold.

Key words: anamorph taxonomy, conidium septation, Heteroconium sooty molds, Pirozynskiella fungicoles