Pseudoastrosphaeriellopsis
Pseudoastrosphaeriellopsis Devadatha, Wanas., Jeewon & V.V. Sarma, Fungal Divers 95: 63 (2019).
Index Fungorum number: IF 555790; Facesoffungi number: FoF 05706, 1 morphological species (Species Fungorum 2021), 1 species with molecular data.
Saprobic on decaying stems and twigs of Avicennia marina and Suaeda monoica, black spots, with short necks on host surface. Sexual morph: Ascomata light brown, solitary to gregarious, immersed to erumpent, globose to subglobose with a rounded base, uni-loculate, coriaceous, brown, short papillate, ostiolate. Ostioles central, cylindrical, straight to oblique, with ostiolar canal lined by hyaline periphyses. Peridium thin- to thick-walled, unequally thickened, composed of two layers, inner stratum with hyaline to pale brown compressed cells of textura angularis, outer stratum with compact brown polygonal cells of textura angularis, fused with the host tissue. Hamathecium composed of numerous, filamentous, septate, branched, hyaline pseudoparaphyses. Asci 8-spored, bitunicate, cylindric-clavate to clavate, with a short, thick pedicel, apically rounded and thickened with an ocular chamber. Ascospores overlapping 1–2-seriate, brown, fusiform to broadly fusiform, slightly curved with round to acute ends, slightly constricted at the 3rd septum and rarely at other septa, broader in the middle and tapering towards the ends, septate, with hyaline apical and terminal ends, smooth-walled, lacking guttules and mucilaginous sheath. Asexual morph: Unknown (adapted from Devadatha et al. 2019).
Type species: Pseudoastrosphaeriellopsis kaveriana Devadatha, Wanas., Jeewon & V.V. Sarma
Notes: Pseudoastrosphaeriellopsis is characterised by immersed to erumpent, light brown ascomata with straight to oblique ostioles, cylindric-clavate to clavate asci, and fusiform to broadly fusiform ascospores. Pseudoastrosphaeriellopsis resembles Pseudoastrosphaeriella in having immersed ascomata below the host epidermis, erumpent, uniloculate, coriaceous, brown and short papillate asci, with trabeculate pseudoparaphyses (Phookamsak et al. 2015). Pseudoastrosphaeriellopsis can be distinguished from Pseudoastrosphaeriella in having globose to subglobose ascomata, immersed in host tissue, with fusiform to broadly fusiform ascospores. Pseudoastrosphaeriellopsis also resembles Neotrematosphaeria but differs in having immersed ascomata, with pore-like ostiole, and ascospores lacking appendages, whereas the latter has semi-immersed ascomata with crest-like ostiole and ascospores with appendages at both ends (Thambugala et al. 2015). Pseudoastrosphaeriellopsis also shares similarities with Trematosphaeria in having 5-septate ascospores and overlapping ascospore dimensions but differs in having immersed ascomata below the host epidermis, short papilla and light brown, fusiform to broadly fusiform, slightly curved ascospores (Tanaka et al. 2015). Pseudoastrosphaeriellopsis is morphologically and phylogenetically a well-supported genus in Pseudoastrosphaeriellaceae. Molecular markers available for Pseudoastrosphaeriellopsis are ITS, LSU, SSU, RPB2 and TEF-1.
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