Pleosporales » Striatiguttulaceae

Serusiauxiella

Serusiauxiella S.H. Jiang, Lücking & J.C. Wei in Jiang et al., Fungal Diversity 102: 274 (2020).

Index Fungorum number: IF 833565; Facesoffungi number: FoF 08889, 3 morphological species (Species Fungorum 2022), 3 species with molecular data.

Lichenized on leaves in terrestrial, lowland to montane, tropical to subtropical habitats. Thallus (pseudo-)corticate, light grey-green, subcuticular. Photobiont Trentepohlia. Sexual morph: Ascomata perithecia, immersed-erumpent, black but mostly covered by thallus layer, lens-shaped to wart-shaped, carbonaceous, ostiolate. Involucrellum present, carbonized. Excipulum prosoplectenchymatous, pale. Hamathecium comprising hyaline, fexuose, unbranched or very rarely branched and anastomosing. Asci 8-spored, bitunicate, fissitunicate, cylindrical to narrowly obclavate, shortly pedicellate, with narrow ocular chamber, non-amyloid. Ascospores irregularly arranged to biseriate, fusiform, hyaline, uniseptate, with thin eusepta and rectangular lumina, smooth-walled, constricted at the septa. Asexual morph: Pycnidia common, immersed to erumpent, visible as black dots. Conidia acrogenous, either macro- or microconidia; macroconidia uniseptate, bacillar, with gelatinous appendages becoming extremely long in squash mounts (as if suspended on gelatinous threads), hyaline; microconidia aseptate, ellipsoid to fusiform, small, hyaline (adapted from Jiang et al. 2020).

 Type species: Serusiauxiella filifera S.H. Jiang, Lücking & J.C. Wei

Notes: Serusiauxiella is characterised by immersed-erumpent, black ascomata, cylindrical to narrowly obclavate, shortly pedicellate asci and fusiform, hyaline, uniseptate ascospores. Serusiauxiella resembles Strigula sensu stricto but differs in having macroconidial appendages (Jiang et al. 2020). Serusiauxiella also differs from members of Strigula sensu stricto in having a Trentepohlia photobiont while the latter is associated with Cephaleuros. Serusiauxiella is morphologically and phylogenetically a distinct genus in Strigulaceae. Molecular markers available for Serusiauxiella include ITS, SSU, RPB2, TEF-1.

 

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