Pleosporales » Astrosphaeriellaceae

Quercicola

Quercicola Jayasiri, E.B.G. Jones & K.D. Hyde, in Jayasiri et al., Mycosphere 10(1): 29 (2019).

 Index Fungorum number: IF 555532; Facesoffungi number: FoF 05233, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.

Saprobic on Quercus sp. Sexual morph: Ascomata gregarious, semi-immersed beneath host epidermis, visible as numerous, raised, dome-shaped areas on the host surface, hemispherical, flattened, or wedge-shaped at the base, uniloculate, dark brown, carbonaceous, glabrous with rough walls, ostiolate. Ostioles central, apapillate, with carbonaceous, and thin, slit-like opening. Peridium of unequal thickness, poorly developed at the base, thick at sides towards the apex, composed of several layers of dark brown to black, pseudoparenchymatous cells, with host cells plus fungal tissue, arranged in textura angularis to textura prismatica. Hamathecium composed of dense, filiform, trabeculate pseudoparaphyses, anastomosing among the asci, embedded in a hyaline gelatinous matrix. Asci 8-spored, bitunicate, cylindric-clavate, or obclavate, with short furcate to truncate pedicel, apically rounded, with a truncate ocular chamber. Ascospores overlapping, 1–3-seriate at the base, uni-seriate at the apex, hyaline, fusiform with acute ends, 1–5- septate, constricted at the medium septum, upper cell wider than lower cell, guttulate, surrounded by thick asymmetric wall. Asexual morph: Unknown (adapted from Jayasiri et al. 2019).

Type species: Quercicola fusiformis Jayasiri, E.B.G. Jones & K.D. Hyde

Notes: Quercicola is characterised by dome-shaped, carbonaceous ascomata with poorly developed base, cylindric-clavate, or obclavate asci and hyaline, fusiform ascospores. Phylogenetically, Quercicola is a distinct genus in Astrosphaeriellaceae. Molecular markers available for Quercicola are ITS, LSU, SSU, RPB2 and TEF-1.

 

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