Sclerenchymomyces
Sclerenchymomyces Phukhams. & K.D. Hyde, in Phukhamsakda et al., Fungal Diversity: 10.1007/s13225-020-00448-4, [41] (2020).
Index Fungorum number: IF 557110; Facesoffungi number: FoF 07287, 2 morphological species (Species Fungorum 2022), 2 species with molecular data.
Saprobic on dead or dead branch of herbaceous or woody plants in terrestrial habitats. Sexual morph: Ascomata covered by plant epidermis, located on the surface of host substrate, black, shiny, superficial to semi-immersed, solitary, globose, black, ostiolate. Ostioles central, short, filled with hyaline cells. Peridium composed of blackish to dark brown cells of textura angularis, thick, multilayered, scleroplectenchymatous cells, cells towards the inside lighter. Hamathecium composed of numerous, branched, septate, pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindrical, short-pedicellate. Ascospores uniseriate, partial overlapping, muriform, broad ellipsoidal, narrowed towards the ends, initially hyaline, becoming brown at maturity, constricted at median septum, guttulate, surrounded by a mucilaginous sheath (adapted from Wanasinghe et al. 2016). Asexual morph: Conidiomata pycnidial, solitary, sometimes aggregated, uniloculate or multiloculate, erumpent or superficial on host substrate, with black shiny ostioles, globose to subglobose, coriaceous, dark brown to brown. Ostioles central, papillate, oblong. Conidiomatal wall thick-walled, multilayered, scleroplectenchymatous or pseudoparenchymatous cells, fat at base, composed of textura angularis, lined with a thick hyaline layer bearing conidiogenous cells. Conidiophores reduced to conidiogenous cells. Conidiogenous cells enteroblastic, phialidic, determinate, discrete, sub-cylindrical to truncate, smooth-walled, hyaline, arising from the inner layers of conidiomata. Conidia ellipsoid or cylindrical to oblong, rounded at both ends, slightly curved, hyaline when immature, yellowish at maturity, aseptate or septate, guttulate, smooth-walled (adapted from Phukhamsakda et al. 2020).
Type species: Sclerenchymomyces clematidis Phukhams. & K.D. Hyde
Notes: Sclerenchymomyces is characterised by black, shiny, superficial to semi-immersed ascomata with a multilayer of scleroplectenchymatous tissue. Sclerenchymomyces resembles Leptosphaeria sensu stricto in having scleroplectenchymatous or plectenchymatous cell type in the peridium. The asexual morph of Sclerenchymomyces is characterised by oblong, brown phragmoconidia in nature and phoma-like characters in culture. Molecular markers available for Sclerenchymomyces are LSU, SSU, ITS, RPB2 and TEF-1.
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