Palmiascoma
Palmiascoma Phook. & K.D. Hyde, in Liu et al., Fungal Diversity: 10.1007/s13225-015-0324-y, [65] (2015).
Index Fungorum number: IF 550926; Facesoffungi number: FoF 00428, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.
Saprobic on palms. Sexual morph: Ascomata gregarious, scattered to clusterred, semi-immersed to erumpent, visible as raised, dark spots on the host surface, uniloculate, conical to subglobose or irregular, glabrous, ostiole central, with minute papilla. Peridium composed of several layers, of brown to dark brown, pseudoparenchymatous cells, organized in a textura angularis. Hamathecium comprising 1–2 μm wide, dense, broad cellular, pseudoparaphyses, with distinct septa, but constricted at the the septa, anastomosing at the apex, embedded in a hyaline gelatinous matrix. Asci 8-spored, bitunicate, fissitunicate, clavate, short pedicellate with rounded to obtuse pedicel, apically rounded, with a well-developed ocular chamber. Ascospores overlapping 1–2-seriate, didymosporous, clavate to ellipsoidal, slightly curved, pale yellowish when young, becoming brown to dark brown at maturity, uniseptate, echinulate, surrounded by a mucilaginous sheath. Asexual morph: Conidiomata pycnidial, solitary, immersed in agar to superficial, visible as black dots covered by vegetative hyphae, uni- to multi-loculate, globose to subglobose, glabrous, ostiole central, with minute papilla. Conidiomata walls composed of several layers of hyaline to dark brown, pseudoparenchymatous cells, outer layers comprising 3–5 cell layers of thick-walled, dark brown to black, organized in a textura angularis to textura prismatica, inner layers comprising 2–3 layers of thin-walled, hyaline, organized in a textura angularis. Conidiophores arising from basal cavity of conidiomata, mostly reduced to conidiogenous cells. Conidiogenous cells holoblastic, phialidic, discrete, ampulliform to cylindrical, hyaline, aseptate, smooth-walled. Conidia solitary, one-celled, oblong to ellipsoidal, with rounded or obtuse ends, initially hyaline, becoming brown at maturity, aseptate, smooth-walled (adapted from Liu et al. 2015).
Type species: Palmiascoma gregariascomum Phookamsak & K.D. Hyde
Notes: Palmiascoma resembles Didymosphaeria in having didymosporous, brown and echinulate ascospores (Zhang et al. 2012). Palmiascoma also resembles Bambusicola but differs in having ellipsoidal, dark brown, echinulate ascospores with broad cellular pseudoparaphyses (Dai et al. 2012, Hyde et al. 2013). Palmiascoma is a distinct and well-supported genus in Bambusicolaceae. Molecular markers available for Palmiascoma are ITS, LSU, RPB2, SSU and TEF-1.
Recent News
Recent paper to be publishedRecent Genus
NothocladosporiumPhillipsiella
Curreya
Recent Species
Nothocladosporium syzygiiPhillipsiella atra
Curreya conorum
