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Abstract: Some years ago we discussed the phenomenon that during the extension of the mushroom stalk the number of nuclei in each cell increased to approximately 20 (Thielke, 1969). We also stated that in Coprinus the number of nuclei may increase by several synchronous divisions up to 256 (Hafner and Thielke, 1970). The main problem in our recent investigations on fine structure in mushroomcells concerns the division of nuclei. Until now it is not clear how the nuclear membrane behaves during this process, whether there is an intranuclear spindle or not (Brushhaber and Jenkins, 1970). Meiosis is usually better known than mitosis is. The reason may be the fact that somatic divisions occur much more rapidly than meiotic divisions. From phase-contrast studies on hyphae, we know that in many fungi (Basidiomycetes, Ascomycetes and Deuteromycetes) somatic divisions last for only a few minutes, whereas both meiotic divisions in Coprinus radiatus, e.g. (synchronous development) last for nearly forty minutes (Lerbs, 1979). In fungi that do not develop their basidia synchronously (Agaricusbisporus, Stropharia rugosa annulata) we do not know the time exactly, perhaps it is the same. Therefore, it is difficult to find continuous stages by fixation.
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