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Mycologia, 96(2), 2004, pp. 343-367.
© 2004 by The Mycological Society of America

Molecular evolution and systematics

Cryptadelphia (Trichosphaeriales), a new genus for holomorphs with Brachysporium anamorphs and clarification of the taxonomic status of Wallrothiella


Martina Réblová 1

     Department of Plant Taxonomy and Biosystematics, Institute of Botany, Academy of Sciences, CZ-252 43 Pruhonice, Czech Republic

Keith A. Seifert

     Biodiversity (Mycology and Botany), Agriculture and Agri-Food Canada, Central Experimental Farm, Ottawa, Ontario, K1A 0C6, Canada

The genus Cryptadelphia (Trichosphaeriales) is described for the presumed teleomorphs of six species of the dematiaceous hyphomycete genus Brachysporium. Cryptadelphia is characterized by the production of dark, leathery perithecia with two-layered walls, cylindrical, long-stipitate asci with eight hyaline, initially aseptate but ultimately 1-septate as-cospores. Zignoëlla groenendalensis is transferred to Cryptadelphia with Wallrothiella melanostigmoides as a synonym. Five new species, i.e., Cryptadelphia abietis, C. brevior, C. obovata, C. pendulispora and C. polyseptata, with their respective Brachysporium anamorphs, are described and illustrated. Phylogenetic analysis of partial large subunit rDNA sequences of two species supports the monophyly of Cryptadelphia and suggests a relationship with the Trichosphaeriales. The monophyly of the Trichosphaeriaceae and the relationships between the Trichosphaeriaceae, Annula-tascaceae and the Sordariales can be questioned, but a conclusive assessment requires phylogenetic analysis of more related taxa. The genus Wallrothiella is redescribed based on new collections of W. congregata and is characterized by the production of tiny, globose ascospores in cylindrical asci. The new collection is proposed as a neotype for the genus.

Key words: Aquaticola, life history, LSU rDNA, phylogeny, systematics




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