Mycelium forming a dense, appressed turf, at first white, becoming pale ochraceous with age; hyphae slender, 2-3 t/ in diameter, at first nonseptate, later giving rise to numerous conidiophores and becoming septate as the protoplasm is diverted into these structures, but dividing into short, thickened segments only in old cultures; conidiophores awl-shaped, simple or branched, often proliferating, variable in size but the unbranched ones mostly 40-60 / in length and 6-8 / in diameter at the swollen base, tapering to 1.5-2 / at the tip; conidia globose, tuberculate, finally rugose, with dense contents and a thick hyaline wall, mostly 11-15 /A in diameter, averaging 13.5 ju.