Cultures similar in growth form to H. rufa but white, floccose during production of conidiophores. Mycelium 4-12µ, diameter, septate. Conidiophores not well defined. Phialides terminal, usually formed singly and as lateral branches of conidiophores, 7-28 x 3-4.5µ. Conidia catenulated from tips of phialides, elliptical, naviculate, sometimes clavate, 7-11 x 3-4µ, smooth, hyaline.

Chlamydospores sometimes present 6-10µ, usually intercalary; lemon-shaped vesicles are usually present among the vegetative mycelium, 15-20 x 10-15µ

Arthrospores common, formed by fragmentation of vegetative mycelium, 10-17 x 3.5-4µ

Mature perithecia were formed in cultures six weeks old. The yellow stroma at first appeared in the form of floccose tufts, but as perithecia matured it became translucent and more or less effuse.

This conidial form is similar to the one described by Bisby (1939) in life history studies of H. pulvinata Fckl. (= H. citrina (Pers.) Fr.). Bisby suggested that it should be classified as a species of Cephalosporium.