Pleosporales » Paradictyoarthriniaceae

Xenomassariosphaeria

Xenomassariosphaeria Jayasiri, Wanas. & K.D. Hyde, in Wanasinghe et al., Fungal Diversity: 10.1007/s13225-018-0395-7, [103] (2018).

Index Fungorum number: IF 553969; Facesoffungi number: FoF 03849, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Saprobic on terrestrial plant parts. Sexual morph: Ascomata scattered, gregarious semi-immersed to erumpent through host tissue, small black dots on the host surface, uniloculate, globose to subglobose, with papillate ostioles. Peridium thick-walled, of unequal thickness, composed of 6–8 layers, hyaline inner layers to brown outer layer, pseudoparenchymatous cells, arranged in a textura angularis to textura globulosa. Hamathecium composed of numerous, filamentous, cellular pseudoparaphyses, with distinct septa, embedded in mucilaginous matrix. Asci 8-spored, bitunicate, fissitunicate, broadly cylindrical to cylindric-clavate, subsessile to short pedicellate, apically rounded with well-developed ocular chamber. Ascospores overlapping 1–2 seriate, fusiform, asymmetric, hyaline to brown, 6–8-septate, slightly curved, constricted at the septa, thick-walled with sheath. Asexual morph: Unknown (adapted from Wanasinghe et al. 2018).

Type species: Xenomassariosphaeria rosae Jayasiri, Camporesi & K.D. Hyde

Notes: Xenomassariosphaeria is characterised by scattered or gregarious, semi-immersed to erumpent ascomata, broadly cylindrical to cylindric-clavate, subsessile asci and fusiform, asymmetric, hyaline to brown, 6–8-septate ascospores. Xenomassariosphaeria resembles Massariosphaeria in having moderately large, thick-walled, ascospores enclosed by a conspicuous gelatinous sheath (Tanaka and Harada 2004). Xenomassariosphaeria is phylogenetically a well segregated genus in Paradictyoarthriniaceae with high support. Molecular markers available for Xenomassariosphaeria are ITS, LSU, SSU and TEF-1.

 

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