Marasasiomyces karoo (B. Sutton & Marasas) Crous, Phytotaxa 202(2): 86 (2015)
≡ Tiarosporella graminis var. karoo B. Sutton & Marasas, Trans. Br. mycol. Soc. 67(1): 73 (1976)
Index Fungorum: IF 811253
Saprobic on dead stems of Eriocephalus sp. (Asteraceae). Sexual morph: undetermined. Asexual morph: Conidiomata 150–700 µm diam., 440–550 µm high, dark brown to black, semi-immersed, subglobose to pyriform, unilocular, setose, thick-walled, ostiolate. Ostiole 210–330 × 80–140 µm, single, subcylindrical, with an elongated neck rounded at the apex, centrally located. Setae 3–4 µm wide, brown to dark brown, septate, branched, smooth to verruculose. Conidiomata wall 30–60 µm wide, composed of thick-walled, brown to dark brown cells of textura angularis in outer part, thick-walled, pale brown to hyaline cells of loose textura angularis in inner part. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 10–20 × 2–3 µm, hyaline, holoblastic, determinate, cylindrical, arising from the inner cavity of conidiomata (Crous et al. 2015b). Conidia 19–23.5 × 4.7–8 µm ( = 21 × 6 µm; n = 10), hyaline, subcylindrcial to fusiform, rounded at the apex, slightly truncated at the base, unicellular, straight or slightly curved, smooth, bearing a cone-like, mucoid apical appendage.
Material examined: South Africa. Cape Province: Colesberg, on dead stems of Eriocephalus sp. (Asteraceae), W.F.O. Marasas, February 1971 (IMI 186782, isotype).
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.