752 Wisconsin Academy of Sciences, Arts, and Letters . 
Figs. 1,2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 6. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
Fig. 11. 
Fig. 12. 
Fig. 13. 
Fig. 14. 
Fig. 15. 
Fig. 16. 
EXPLANATION OF PLATE XLVI. 
Vegetative cells. Nuclei showing relation of chromatin and 
centers. 
Hyphal cell from the mycelium, showing nucleus with central 
body. 
Young ascogone showing one nucleus with its center, and one 
of the cells of the hyphal envelop. 
Young ascus, with two nuclei before fusion. 
Primary nucleus, spirem stage. 
Late stage in fusion of the two nuclei; centers and chromatin 
systems still separate. Ascus about one-half mature size. 
Spindle formation, first division of primary nucleus. 
Spindle, second division. 
Formation of spindles in third division. 
Four-nucleated stage, two of the nuclei showing chromatin 
oriented on the central bodies. 
Eight-nucleated stage, showing the persistent asters and the 
folding over of the rays. 
Stage in spore formation; two spores completely delimited; 
traces of the rays remain. 
Spore formation, showing extreme lengthening of nuclear beak. 
Nucleus resuming spherical form by withdrawal of beak. Traces 
of astral rays. 
Complete spores, wall being deposited. 
