Conidium formation in some species of Aphanocladium W. Gams, Verticimonosporium Matsushima, Sibirina Arnold, Pseudofusarium Matsushima and Craspedodidymum Hol.-Jech. is discussed and compared with other examples. Conidiogenous cells with solitary and with serial conidia may occur in apparently closely related species. It is questionable, whether the term phialides has to be restricted to the latter group. The new species Aphanocladium spectabile and Sibirina orthospora are described.