Thyrsidina Höhn., Annls mycol. 3(4): 337 (1905)
Facesoffungi number: FoF 07714
Ascomycota, genera incertae sedis
Caulicolous and fungicolous. Sexual morph: undetermined. Asexual morph: Conidiomata pale yellow to yellow-orange, sporodochial or spuriously acervular, solitary to gregarious, initially immersed, ultimately erumpent, pulvinate, gelatinous. Ostiole absent, dehiscence by irregular rupture of the overlapping host tissue. Subhymenium composed of thick-walled, hyaline, septate, compact hyphae of textura oblita invested in mucus at the base. Conidiophores arising from the upper cells of basal stroma, hyaline, cylindrical or irregular, branched, septate, smooth-walled, with clamp connections giving rise to lateral or terminal conidiogenous cells, invested in mucus. Conidiogenous cells hyaline, holoblastic, cylindrical or irregular, integrated, determinate, smooth-walled. Conidia hyaline, arising from fusion of several aggregated clamp connections, at maturity clavate to bulbous or irregular in shape, with narrow and truncate base, dictyoseptate, constricted at the septa, smooth-walled, guttulate (adapted from Morgan-Jones 1977, Nag Raj & DiCosmo 1984).
Type species: Thyrsidina carneominiata Höhn., Annls mycol. 3(4): 337 (1905)
Notes：Thyrsidina carneominiata is a hyperparasitic fungus on the ascomata of Diaporthe platanoides and Melanconium sp. on Acer pseudoplatanus (Sapindaceae) (von Höhnel 1905, Nag Raj and DiCosmo 1984). A revised description and a detailed illustration were published by Morgan-Jones (1977), Nag Raj and DiCosmo (1978, 1984). Thyrsidina is characterized by having sporodochial or spuriously acervular conidiomata, hyaline, compact conidiophores with clamp connections at the septa and bulbous or irregular conidia. Nag Raj and DiCosmo (1984) considered Thyrsidina as asexual morph of an undetermined basidiomycete, but no evidence is provided for this connection. The genus has remained monotypic.
Distribution: Austria (Nag Raj 1984).
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.