Myelosperma Syd. & P. Syd., Annls mycol. 13(1): 38 (1915)
Xylariomycetidae, Xylariomycetidae families incertae sedis, Myelospermataceae, Myelosperma
Index Fungorum number: IF3351; 5 morphological species (Species Fungorum 2020).
Pathogenic or saprobic on various plants. Sexual morph: Pseudostromata weakly raised, visible as blackened ostiolar dots, immersed, multiloculate, clustered around a common central pore. Ascomata in vertical section subglobose or ellipsoidal, brown, necks mostly eccentric leading to the common central pore. Peridium comprising mostly brown-walled, elongate cells, inwardly hyaline and becoming textura intricata and fusing with the host tissue at the outside. Paraphyses numerous, hypha-like, filamentous, septate, unbranched, tapering distally. Asci 8-spored, unitunicate, cylindrical, long-pedicellate, apically rounded, with a J-, refractive, subapical, discoid ring. Ascospores overlapping uniseriate, hyaline, irregularly ellipsoidal, curved or straight, some narrower at the center, some lunate, unicellular, and surrounded by a distinct mucilaginous sheath. Asexual morph: Undetermined (adapted from Maharachchikumbura et al. 2016).
Type species: Myelosperma tumidum Syd. & P. Syd., Annls mycol. 13(1): 38 (1915)
Notes: Myelosperma was established by Sydow & Sydow (1915) to accommodate Myelosperma tumidum which occurs on the dead rachis of Cocos nucifera. Four species were introduced from different hosts, substrates and countries (Ahmad 1971, Hyde et al. 1996, Aptroot et al. 1998, Hyde & Wong 1999).