Cultures similar to H. rufa, floccose, showing distinct zones in young cultures, usually discolouring media isabelline or yellow. Mature conidia formed within seven days, yellowish green to dark olivaceous. Mycelium 3-7p, diameter. Conidiophores produced singly or in tufts, often branched. Phialides arranged in terminal whorls or immediately below transverse septa, flask-shaped, 3-7 x 3-5µ. Conidia globose or oval, 2.5-4.5 x 2-3µ, echinulate and pigmented.

Chlamydospores rarely present globose, 5-8µ diameter, usually intercalary. Cultures are typical of those of T. viride.