Vicosamyces
Vicosamyces Firmino, A.R. Machado & O.L. Pereira, in Phookamsak et al., Fungal Diversity 95: 12 (2019).
Index Fungorum number: IF 822577; Facesoffungi number: FoF 03786, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Biotrophic or necrotrophic associated with plant disease on living leaves, forming a large, irregular, slightly raised, rough, orange brown wound, with orange margin. Sexual morph: Ascomata immersed in orange brown wound tissue, solitary, brown, globose to pyriform, ostiolate. Peridium thin-walled, composed of dark brown, pseudoparenchymatous cells, of textura angularis to textura prismatica. Hamathecium comprising numerous, cylindrical, filiform, septate, unbranched, hyaline pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindrical, subsessile to short pedicellate, with furcate pedicel, apically rounded with well-developed ocular chamber. Ascospores overlapping 1–2-seriate, brown, 2-celled, apiosporous, smaller at the lower cell, subfusoid to clavate, or obovoid, narrower towards the lower cell. Asexual morph: Unknown (adapted from Phookamsak et al. 2019).
Type species: Vicosamyces venturisporus Firmino, A.R. Machado & O.L. Pereira
Notes: Vicosamyces is characterised by solitary, brown, globose to pyriform ascomata, numerous, cylindrical, filiform pseudoparaphyses, fissitunicate, cylindrical asci and 1–2-seriate, brown, 2-celled, apiosporous ascospores (Morin et al. 2010, Thambugala et al. 2014, Ariyawansa et al. 2015). Vicosamyces was placed in Didymosphaeriaceae based on morphology and phylogenetic analysis of LSU and ITS sequence data. Vicosamyces is closely related to Austropleospora but can be differentiated as the latter has subglobose ascomata immersed in brown necrotic spots on Chrysanthemoides monilifera subsp. rotundata (Asteraceae) while the former has globose to pyriform ascomata immersed in large, orange-brown wound of Eugenia sp. (Myrtaceae). Phookamsak et al. (2019) reported that the phylogenetic relationship of Austropleospora and Vicosamyces is still not well-resolved and more genes are needed for a better phylogenetic resolution. Vicosamyces is currently a distinct genus in Didymosphaeriaceae but more taxa and gene regions are needed to clarify the taxonomic placement of the genus. Molecular markers available for Vicosamyces are ITS and LSU.
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