抄録
1. The nuclear behaviour and life-cycle in Absidia glauca (Mucorales) have been examined by a variety of microscopical techniques.
2. The uninucleate sporangiospores germinate to produce a coenocytic multinucleate mycelium. Vegetative nuclear division involves persistent nuclear envelope, asynchronous chromatid separation and lack of a metaphase plate. Sporangiospores formed inside the sporangium by a process of progressive cleavage, each protoplast containing a single nucleus.
3. Zygospores form after fusion by (+) and (-) gametangia on different mycelia. Nuclei fuse in pairs in the forming zygospore, but some nuclei remain haploid. Before zygospore dormancy a number of both haploid and diploid fusion nuclei degenerate. Remaining fusion nuclei are enlarged and probably in meiotic prophase before dormancy. Meiotic stages were not observed.
4. Zygospores did not germinate after dormancy by forming germ sporangia. Instead, hyphal development occurred inside a number of zygospores and a vegetative mycelium was produced. It is not known whether diploid nuclei divide meiotically or become haploid by successive chromosome loss during this process.
