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Taxonomic review of the genus Holwaya (Ascomycota, Fungi)

The genus Holwaya was considered to be monospecific until recently because of extensive species synonymy. Seven species have been described or combined in the genus: H. gigantea, H. leptosperma, H. mucida (with subsp. nipponica), H. ophiobolus, H. pusilla, H. salicis, and H. tiliacea. Nowadays most of these taxa are considered to be synonyms of H. mucida, except H. pusilla that was transferred to the genus Claussenomyces, and H. salicis to Durandiella. Since the first more thorough molecular phylogeny of Helotiales (Wang et al. 2006), there have been few changes in the classification until that proposed by Baral (2016). Holwaya was previously considered a member of the family Bulgariaceae (Lumbsch & Huhndorf 2010), but it was removed from this family by Crous et al. (2014) who regarded Bulgariaceae as a synonym of Phacidiaceae. Although Holwaya was never included in Phacidiaceae, Baral (2016) expanded the concept of Phacidiales by adding other families and placing the genus Holwaya in Tympanidaceae. The aim of this work is to provide a taxonomic review of the genus Holwaya based on data gathered by the authors through the last few decades. This includes new microscopical features revealed by studies of the material in living state and new taxonomic and systematic information, such as the correct generic affiliation of Claussenomyces tympanoides (C. pusillus) based on type studies.

integrative taxonomy ; phacidialean fung ; reclassification ; Tympanidaceae

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