‖pl. [ L. imperfecti imperfect. ] (Bot.) A heterogenous phylum of fungi which lack a sexual phase, or of which the sexual phase is not known. Some undoubtedly represent the conidium stages of various Ascomycetes. It is not considered a natural phylum, and is also called the Deuteromycota. The group is divided into the orders Sphæropsidales, Melanconiales, and Moniliales. It includes the genera Penicillium and Aspergillus, which reproduce asexually by means of conidia. [ Webster 1913 Suppl. +PJC ]