Cytology of ascus development in the genusChaetomidium

摘要

The cytology of the ascus initiation and the ascus development in two species of the genusChaetomidiumFuckel are described. InC. subfimeti, the initial of the ascus is the binucleate penultimate cell of the crozier, whereas inC. barbatum, in the absence of croziers, the ascus initial is a binucleate ascogenous cell. The sequential stages of ascus development (one-, two-, four-, and eight-nucleate asci) in the two species are reported. Mature ascospores are binucleate.