LIGHT AND ELECTRON-MICROSCOPIC STUDY OF MITOSIS IN BULLERA-ALBA AND THE HISTOCHEMISTRY OF SOME CYTOPLASMIC SUBSTANCES

Mitosis in the imperfect yeast-like basidiomycete Bullera alba was studied by comparative light and electron microscopy. During mitosis the chromatin containing part of the nucleus moved into the progeny cell, and the nucleolus containing part of the nucleus remained in the parent cell. The two portions of the nucleus then separated and the nucleolar part degenerated. Metaphase and anaphase took place in the progeny cell. Subsequently one mass of chromatin returned to the parent cell, and two new nuclei were formed. The study concentrated on the nuclear envelope, nucleolus, spindle pole body, chromatin, spindle, and cytoplasmic microtubules. Mitosis in B. alba was compared with reports of mitosis in other basidiomycetes, the Uredinales, and the Ascomycotina and was deemed closest to the heterobasidiomycete yeasts. Histochemical evidence for the presence of lipid, glycogen, and polyphosphate in the cytoplasm was presented. © 1979 Springer-Verlag.