Contributions to the Cytology of Fungi

I. Chromosome Number in Agaricaceae

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1. The young basidium is binucleate in the primary stage. After the fusion of these two primary nuclei, the reduction division follows.
2. All important phases of meiosis in higher plants are observed also in Agaricaceae.
3. The mode of gemini-formation seems to be parasyndetic.
4. The typical synaptic knot is seen within the nucleus.
5. In diakinesis, a constant number of gemini is discernible.
6. The spindle is of intranuclear origin, at each pole of which can be seen a centrosome.
7. As a rule, the behaviour of heterotype chromosomes in separa-tion is irregular.
8. Excepting Mycena haematopoda, homotypic division follows without passing into interkinesis, and gives rise to four daughter nuclei.
9. Sometimes, a new mitosis takes place after entrance of the daughter nucleus into the spore, giving rise to a binucleate basidiospore.
10. The haploid or gametic number of chromosomes of the eight species of Agaricaceae are determined as follows:
Hypholoma fasciculare (HuDS.) FR. 2
Pholiota sp. 2
Tricholoma rutilans SCHAEFF. 2
Cortinarius cinnamomeus L. 4
Russula subfoetens W. G. SM. 4
Pleurotus ostreatus JACQ. 4
Coprinus micaceus B. 4
Mycena haematopoda PERS. 6