1190 
Wisconsin Academy of Sciences, Arts, and Letters . 
EXPLANATION OF FIGURES. 
All figures were drawn w r ith the aid of the Camera lucida and with 
the 1-16 Leitz objective, ocular 4 and tube length 17 cm. The drawings 
were made with a magnification of about 1975 diameters and are 
reduced somewhat in reproduction. 
Figs. 1, 2. Longitudinal sections through ascus. Equatorial plate stage 
of first division of the nucleus. 
Figs. 3, 4. Spindles of third division. Both figures drawn from the 
same ascus but in different planes. 
Figs. 5, 6, 7, 8. Longitudinal section through the ascus at stage of 
interastral zones. 
Fig. 9. Oblique section through the ascus showing interastral zones. 
Fig. 10. Cross section throug ascus showing interastral zones. 
Fig. 11. Longitudinal section through ascus when rays are just be¬ 
ginning to curve downward about the nucleus. 
Fig. 12. Longitudinal section through ascus when fibres are fused near 
the central j3ody. 
Fig. 13. Longitudinal section of ascus. Spores completely delimited. 
Centers still pointing in all directions. 
Fig. 14. Spores little later. Centers all pointing downward. 
Fig. 15. Spores partly elongated. 
Fig. 16. Spores much elongated. Centers still attached. 
Fig. 17. Cross section of elongated spores after nucleus is drawn back 
to center of ascus. 
