Poaceascoma
Poaceascoma Phook. & K.D. Hyde, in Phookamsak et al., Cryptog. Mycol. 36(2): 231 (2015).
Index Fungorum number: IF 551141; Facesoffungi number: FoF 00622, 5 morphological species (Species Fungorum 2022), 5 species with molecular data.
Saprobic on Poaceae. Sexual morph: Ascomata solitary to gregarious, semi-immersed to erumpent, uniloculate, globose to subglobose, ostiole central, with short to long papilla. Papilla erumpent, exposed parts covered with raised brown tufts of hyphae. Peridium thick walled, of equal thickness, composed of several layers of dark brown to black, pseudoparenchymatous cells, arranged in a textura angularis to textura prismatica. Hamathecium composed of dense, cellular pseudoparaphyses, with distinct septa, not constricted at the septa, anastomosing at the apex, embedded in a gelatinous matrix. Asci 8-spored, bitunicate, fissitunicate, elongate-cylindrical, short pedicelate, apically rounded with ocular chamber. Ascospores fasciculate, spirally arranged within the ascus, filiform, hyaline, multi-septate, not constricted at the septa, smooth-walled, ascospores are often longer than asci. Asexual morph: Unknown (adapted from Phookamsak et al. 2015).
Type species: Poaceascoma helicoides Phookamsak & K.D. Hyde
Notes: Poaceascoma is characterised by setose ascomata with filiform ascospores. Poaceascoma resembles the genera Acanthophiobolus, Leptospora, Ophiobolus and Ophiosphaerella in having filiform ascospores (Shoemaker 1976, Boonmee et al. 2011, 2014, Zhang et al. 2012). Poaceascoma resembles Acanthophiobolus in having setose ascomata with ascospores spirally arranged in the asci (Boonmee et al. 2011, 2014). Poaceascoma differs from Acanthophiobolus in having larger, semi-immersed to erumpent ascomata with short to long beaks on grasses (Boonmee et al. 2011, 2014). Poaceascoma differs from Leptospora in having turfs of hyphae neighboring the ascomata and ascospores arranged in compact spirals in the asci and does not stain the host red compared to Leptospora with aseptate, filiform ascospores loosely twisted in the ascus and glabrous ascomata with reddish papilla and staining the host red. Ophiobolus and Ophiosphaerella are accommodated in Phaeosphaeriaceae while Poaceascoma is a distinct and well-supported genus in Lentitheciaceae. Poaceascoma can be differentiated from similar genera based on DNA sequence data. Molecular markers available for Poaceascoma are ITS, LSU, SSU, Actin, BTUB, RPB2 and TEF-1.
Recent News
Recent paper to be publishedRecent Genus
NothocladosporiumPhillipsiella
Ampelomyces
Recent Species
Nothocladosporium syzygiiPhillipsiella atra
Curreya conorum
