Serusiauxiella S.H. Jiang, Lücking & J.C.Wei in Jiang et al., Fung. Div. 102: 274.
MycoBank number: MB 833565; Index Fungorum number: IF 833565; Facesoffungi number: FoF 08889; three morphologically and phylogenetically delimited species (Jiang et al. 2020b).
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 0.5–0.7 µm wide paraphyses, hyaline, flexuose, 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, 1-septate, with thin eusepta and rectangular lumina, smooth-walled, constricted at the septa. Asexual morph: Pycnidia common, immersederumpent, visible as black dots. Conidia acrogenous, either macro- or microconidia; macroconidia 1-septate, bacillar, with gelatinous appendages becoming extremely long in squash mounts (as if suspended on gelatinous threads), hyaline; microconidia aseptate, ellipsoid to fusiform, small, hyaline.
Chemistry: No secondary substances known.
Type species: Serusiauxiella filifera S.H. Jiang, Lücking & J.C. Wei in Jiang et al., Fung. Div. 102: 275.
Notes: This entirely novel genus was descovered in eastern Asia, with three species known thus far from China (Jiang et al. 2020b). It most closely resembles Strigula sensu stricto and differs mainly in the highly unusual mac- roconidial appendages. The known species otherwise have a morphology akin towards S. microspora.
Species