Ultrastructure of the asexual apparatus in Mycotypha (Mucorales).

The development of the asexual apparatus of Mycotypha africana and Mycotypha poitrasii observed by means of scanning electron microscopy is reported. Using ultrathin sections and freeze-fracture replicas, sporangiole structure is described. Sporangiospore structure is compared with that of other members of the Thamnidiaceae.