Aposphaeria pulviscula (Sacc.) Sacc.,Michelia 2(no. 6): 4 (1880)
Synonymy:Phoma pulviscula Sacc., Michelia 1(no. 2): 259 (1878)
Coniothyrium pulviscula (Sacc.) Kuntze, Revis. gen. pl. (Leipzig) 3(2): 459 (1898)

Saprobic on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata (30–)54–100 μm diam., (56–)84–133 μm high, brown, pycnidial, solitary to gregarious, semi-immersed to superficial, globose to subglobose, unilocular, glabrous, ostiolate. Ostiole circular, centrally located. Conidiomatal wall 9–13 μm wide, composed of thick-walled, dark brown to brown cells of textura angularis. Conidiophores 1–4 μm wide, arising from the inner cavity of the conidiomata, hyaline, cylindrical, branched at the base, septate, smooth-walled. Conidiogenous cells hyaline, enteroblastic, phialidic, cylindrical, integrated or discrete, determinate, smooth-walled, with terminal or lateral apertures. Conidia 2.3–2.8×0.8–1.4 μm (x̄ =2.5×1.2 μm, n=10), hyaline, cylindrical to ellipsoidal, unicellular, smooth, guttulate (Tian et al. 2015).

Material examined – Italy, Padova, on bare wood of Salix udensis (Salicaceae), January 1878, Saccardo (IMI 202557, isotype).

Fig. 1 Aposphaeria pulviscula (isotype, from slides). a Herbarium label of Aposphaeria pulviscula. b–d Vertical sections through peridium. f–g Conidiogenous cells. Scale bars: b–c=50 μm, d–e=25 μm, f–g=5 μm

Fig. 2 Aposphaeria pulviscula (re-drawn from Sutton 1980, isotype). a Conidia. b Conidiophores. c Vertical section of a conidioma. Scale bars: a=5 μm, b=10 μm, c=25 μm