Pleosporales » Pleosporales, genus incertae sedis


Daruvedia Dennis, Belarra (Bilbao) 2(4): 25 (1988).

Index Fungorum number: IF 25507; Facesoffungi number: FoF 06671, 5 morphological species (Species Fungorum 2022), No molecular data available.

Saprobic on host. Sexual morph: Ascomata scattered, rarely gregarious, erumpent through bark or wood, immersed to nearly superficial with base remaining immersed in the host tissue, depressed spherical, subglobose, broadly or narrowly conical, black, roughened, apex obtuse, pointed, discoid-flattened, sometimes hardly protruding in case of small fully immersed ascomata, and then surrounded by a black clypeus-like disc. The discs often bear tufts of brown hairs seated on an easily removed cushion-like structure. Peridium two-layered, outer layer nearly homogenous, of very thick-walled cells with small lumina, inner layer textura prismatica, with unevenly pigmented walls, giving the appearance of alternating dark and pale columns oriented perpendicular to the surface. Hamathecium of dense, very long pseudoparaphyses, broad, sparse. Asci 8-spored, bitunicate, but not fissitunicate, cylindrical to fusiform, short stipitate, with a narrow ocular chamber and a small inconspicuous apical apparatus. Ascospores filiform, apex obtusely rounded without evident mucilage, base slightly tapered with inconspicuous mucilaginous material on some spores, yellowish, lying parallel in the ascus, filled with guttules, obscurely 30−40-septate, slightly constricted at septa at full maturity, smooth-walled. Asexual morph: Unknown (adapted from Hu et al. 2010).


Type species: Daruvedia bacillata (Cooke) Dennis


Notes: Daruvedia is characterised by scattered, rarely gregarious, erumpent ascomata, cylindrical to fusiform, short stipitate asci and filiform, 30−40-septate, yellowish ascospores. Daruvedia was previously referred to Acerbia, Ceratostomella and Ophioceras (Hu et al. 2010). Dennis (1988) observed the type material of Sphaeria bacillata and found no ascomata but he identified his collection as identical with Sphaeria bacillata based on Cooke’s sketch and drawings of the ascomata, ascus and ascospore on the herbarium envelope and erected a new genus to accommodate this species. Dennis (1989) gave a detailed account of the taxonomic history of Daruvedia but did not assign the genus to any family or order. In an ongoing survey of North American pyrenomycetes, Barr (1994) studied Daruvedia and accepted the genus proposed by Dennis (1988) for Sphaeria bacillata. Barr (1994) treated Daruvedia in Pleurotremataceae based on the unitunicate asci and similar morphological characters with members in that family. Kirk et al. (2001) listed Daruvedia as Dothideales incertae sedis as Pleurotremataceae sensu Barr was invalid while Kirk et al. (2008) listed Daruvedia in Dothideomycetes incertae sedis. Eriksson (2006) and Lumbsch and Huhndorf (2007) retained Daruvedia in Pleurotremataceae and listed the family in Ascomycota incertae sedis comprising two genera, Pleurotrema and Daruvedia. Hu et al. (2010) provided ITS and LSU sequences of Daruvedia based on pure cultures obtained from the ascomatal spore mass but their sequences clustered close to Exophiala pisciphila. Hu et al. (2010) reported that Exophiala spp. have teleomorphs in Capronia, characterised by short, fusiform, 1−two-celled ascospores while Daruvedia capillata has long filiform ascospores hence, the sequences might not have been from Daruvedia capillata. Hu et al. (2010) agreed with Kirk et al. (2008) and placed Daruvedia in Pleosporales genera incertae sedis. Hu et al. (2010) found an asexual morphic taxon which might be hyperparasitic on Daruvedia bacillata but more studies are needed to verify the relationship of D. bacillata with the unknown fungus. No asexual stage has been linked to Daruvedia bacillata. Daruvedia is currently placed in Pleosporales, genera incertae sedis. More collections with DNA sequence data are needed to confirm the taxonomic placement of the genus.


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