Marasasiomyces Crous, Phytotaxa 202(2): 86 (2015)
Facesoffungi number: FoF 07440
Dothideomycetes, order incertae sedis, Botryosphaeriales, Botryosphaeriaceae
Saprobic on the host plant. Sexual morph: undetermined. Asexual morph: Conidiomata dark brown to black, semi-immersed, subglobose to pyriform, unilocular, setose, thick-walled, ostiolate. Ostiole subcylindrical, with an elongated neck, single, centrally located. Setae brown to dark brown, septate, branched, smooth or verruculose-walled. Conidiomatal wall composed of thick-walled, brown to hyaline cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells holoblastic, determinate, cylindrical, arising from the inner cavity of conidiomata. Conidia hyaline, subcylindrcial to fusiform, unicellular, smooth, bearing a cone-like, mucoid apical appendage.
Notes: The monotypic genus Marasasiomyces was introduced by Crous et al. (2015b) based on M. karoo (= Tiarosporella graminis var. karoo B. Sutton & Marasas). The genus is similar to Eutiasporella in its long-necked, hairy conidiomata, and holoblastic conidiogenous cells. The significant difference between these two genera is that Eutiasporella forms pulvinate, botryose conidiomata in clusters, while it is not the case in Marasasiomyces.
Distribution: South Africa.
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.