396 Wisconsin Academy of Sciences, Arts, and Letters . 
Explanation of Figures 
All the figures were made with the aid of a camera lucida. A Zeiss 
2.30 mm. aprochomatic oilimmersion objective and a no. 12 compensating 
ocular were used f • figures 13-20. A Leitz 1/16 oil immersion and a 
no. 4 ocular were used for the other figures. 
Fig. 1. 
A mature spore of Dacyrmyces, showing the single conspic¬ 
uous nucleus. 
Figs. 2, 3. 
Figs. 4- 7. 
Equatorial plate stage in division of the primary nucleus, 
Later stages leading to the formation of the typical eight- 
celled spore. 
Fig. 8. Division of nuclei preceding the development of first germ 
tubes. 
Fig. 9. A spore with several germ tubes. Some of the tubes contain 
Figs. 10,11. 
a single nucleus, others have two nuclei. One cell has 
two germ tubes. 
Young binucleate basidium. 
Fig. 12. 
Basidium with fusion nucleus. The nucleoles are only par¬ 
tially fused. 
Fig. 13. 
Fusion nucleus from basidium in same stage as figure 12. 
Figs. 14,15. Later spireme stage. The very characteristic massing of 
Fig. 16. 
the chromatim at one side of the nucleus. On the nuclear 
membrane may be detected at the first appearance of the 
body from which the centrosome probably originates. 
Later stage. The two centrosome-like bodies are very dis¬ 
tinct at opposite ends of the nucleus. 
Fig. 17. 
Spindle fibres are appearing as the chromatin becomes or¬ 
ganized into chromosomes. The nucleole is being 
pushed to one side. One centrosome appears double. 
Figs. 18-20. Later stages in primary division, showing typical spindles 
Fig. 21. 
with the centers and astral rays. 
Basidium with both nuclei undergoing the second division. 
Fig. 22. 
Basidium with one nucleus in division, showing the nu¬ 
cleole at one side. The other nucleus is still in a rest¬ 
ing condition. 
Fig. 23. 
Basidium containing four nuclei and showing early stage in 
sterigmata formation. 
Fig. 24. 
Basidium showing four nuclei which have decreased greatly 
in size preparatory to the migration toward the sterig¬ 
mata. 
