Oxydothis atypica Pinruan., in Liu et al., Fungal Diversity: 10.1007/s13225-015-0324-y, [13] (2015)

Index Fungorum Number: IF551015, Facesoffungi number: FoF00485

Etymology atypica refers to the differences from the typical ascospore characters.

Holotypus – Pinruan 135 in BBH.

Saprobic on dead leaves of Licuala longicalycata Furtado in peat swamp. Sexual morph: Ascomata 270–275μm, visible on the host surface as a minute blackened dot with eccentric, periphysate ostiole, immersed, lenticular to subglobose, brown, coriaceous, scattered. Peridium 10–12.5μm wide, comprising 3–6 layers of flattened, brown-walled cells of textura angularis, fusing at the outside with the host tissues. Paraphyses 8.75μm wide at the base, hypha-like, tapering to the apex, longer than asci, not embedded in a gelatinous matrix. Asci 87.5–95×7.5– 8.75μm, 8-spored, cylindrical, unitunicate, thin-walled, pedicellate, apically rounded, with a J+, cylindrical, subapical ring, 5–5.25μm high × 2.2–2.5μm diam. Ascospores 42.5–45×5– 6.5μm, overlapping 2-seriate, hyaline, 1-septate, tapering gradually to a point at the apex with a mucilaginous drop and with a long drawn-out spine at the base.

Material examined – Thailand, Narathiwat Province, Sirindhorn Peat Swamp Forest, on dead leaves of Licuala longicalycata (Arecaceae), 13 February 2002, U. Pinruan (Pinruan 135 in BBH, holotype).

Notes The characteristic features of Oxydothis atypica are immersed ascomata with an eccentric neck, well-developed paraphyses, cylindrical asci with a J+, subapical ring and pointed ascospores (Hyde 1995; Hyde and Alias 2000). This species differs from all species of Oxydothis as it has asymmetrical ascospores, with a short pointed apex and a long spine at the base (Hyde 1995; Fröhlich et al. 2000).

Fig. 1 Oxydothis atypica (holotype). a Colonies on substratum. b Section of ascoma. c Asci with J+ ring. d Asci. e Paraphyses. f–i Ascospores. Scale bars a=1000 μm; b=100 μm; c-i=10 μm