Chaetomium piluliferum J. Daniels 1961

British Isles.

Colonies expanding, becoming brownish due to pigmented hyphae and erect, verrucose hairs; "aleurioconidia" numerous in cultures, often in clusters, spherical or nearly so, thick-walled, colourless, 13-18 μm, formed on short hyphal branches; phialoconidia obovate, colourless, 3-4 × 2-2.5 μm, formed basipetally on clustered ampulliform cells, aggregated in droplets.. Ascomata. Superficial, spherical or obovate, ostiolate, dark grey in reflected light, 150-240 μm, with a brown or reddish brown wall of textura epidermoidea in surface view, cells 2-3.5 μm broad; ascomatal hairs long, flexuous or apically circinate, thick-walled, brown, septate, usually smooth, 4-5.5 μm broad, with a swollen, 6.5-8 μm broad and 10-14 μm long basal cell; thinner verrucose hairs also present. Asci. Obovate or broadly clavate, with a rather short stalk, 8-spored, evanescent, 48-60 × 17-22 μm. Ascospores. Ellipsoidal, with attenuated ends, brown when mature, 13-17 × 8-10 μm, with an apical germ pore. Paraphyses. Not observed.