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ABSTRACT
The sexual and asexual sporulation apparatus of Cokeromyces recurvatus (Thamnidiaceae: Mucorales) was studied using techniques of scanning and transmission electron microscopy. The Mucor-like verrucose zygosporangium, which develops from the fusion of two opposed homogametangia, contains a zygospore with a finely sculptured wall. Cryofracture and thin sections show the wall of the zygosporangium to comprise at least three layers and that of the zygospore two layers. The zygospore can be freed from the zygosporangium by crushing. The zygospore germinates by producing a hypha which develops into a sporangiophore. The sporangiophore develops a terminal vesicle from which numerous recurved pedicels arise, each bearing a multi-spored, deciduous, sporangiole. The thin, persistent wall of the colu- mellate sporangiole is supported by a reticulum of electron-opaque material. The wall of the pedicel is largely fibrillar. Sporangiospores are surrounded by an electron-opaque matrix and possess a zoned wall. The potential taxonomic value of the teleomorph within the Mucorales is indicated.