Chaetomium globosum  

Ascomata 160-300 µm diam, ± spherical to ovoid, olivaceous to dark grey-green in reflected light, with well-developed brown rhizoids. Peridium brown, composed of textura intricata with hyphae 2-4 µm diam. Hairs covering the upper part of the ascoma, 3-5 µm diam at the base, rarely branched, flexuous, undulate or irregularly coiled, strongly verrucose. Interascal tissue none, at least at maturity.  Asci 30-40 x 11-16 µm, clavate, long-stalked, evanescent at an early stage, 8-spored. Ascospores 9-12 x 8-10 x 6-8 µm, limoniform, with the ends weakly apiculate and one lateral face distinctly flattened, pale brown, relatively thick-walled, with one apical germ pore.

Colonies rapidly growing, with pale or olivaceous aerial mycelium and often with greenish or brownish exudates.