Thaxteriella pezizula (Berk. & M.A. Curtis) Petr., Sydowia 7(1-4): 110 (1953).

Sphaeria pezizula Berk. & M.A. Curtis, Grevillea 4(no. 31): 106 (1876)

Saprobic on woody substrates. Mycelium forming a dense velvety subiculum on the surface of the bark, comprising black hyphae. Sexual state:Ascomata236–374 ×365–422µmdiam., superficial, seated on mycelium, solitary to clustered, scattered on substrate, globose to subglobose, turbinate, dark brown to black, shiny, ostiolate, collapsing on drying. Peridium 44.5–55µm, several layers, somewhat thickened, composed of dark brown cells of textura angularis. Hamathecium of 2–3.5 µm wide, filiform, septate, branched, hyaline pseudoparaphyses.Asci (102-)113–146(-151) × 25–34 µm ( = 128 × 30 µm, n = 20), 8-spored, bitunicate, broadly cylindric-subclavate, shorted pedicellate, thickened at apex, lacking a distinct ocular chamber. Ascospores 47–61 × 9.5–13 µm ( = 53 × 11 µm, n = 20), overlapping 2–3-seriate, cylindrical to long fusiform, tapering towards rounded ends, 7-septate, straight or slightly curved, not constricted at septa, hyaline to pale-yellowish. Asexual state: hyphomycetous, helicosporous.Conidiophores erect, up to 180 µm long, brown to dark brown, light-coloured at apex. Conidia 17–21 µm diam., pleurogenous, develop on cylindrical pegs arising from cells of conidiophores, 1½–1¾ times colied, 5–12-septate, hyaline to pale olivaceous brown (from Sivanesan 1984).

Material examined: Unknown location, on dead wood of undetermined timber, collector and date collected are unknown (BPI 800530).

Fig. 1 Thaxteriella pezizula(BPI 800530). a, b Ascomata collapsing when dry (in Fig. a).c L.S. of ascoma. d Peridium. e Pseudoparaphyses. f, g Asci. h-j Ascospores. Scale bars: a-c=200µm, d=50µm, e=5µm, f-g=50µm, h-j=20µm