Abstract
1. Nuclear behavior in the basidia of Amanita caesarea is typical of that in most of the Agaricaceae. After fusion of the two original nuclei, the resulting large fusion nucleus undergoes two meiotic divisions, and each of the four resultant nuclei moves into a spore initial. A final division in the spore results in the formation of a two-nucleate spore. The diploid chromosome number is eight. 2. In addition to the normal nuclei, there are extra-nuclear inclusions, frequently near the base of the basidium. These inclusions resemble nuclei in shape, size, and staining reactions, being readily stained with haematoxylin after the usual fixatives, and with the Feulgen reaction. Such bodies resemble the Nebenkerne found in Coprinus by Sass.
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