1234 Wisconsin Academy of Sciences, Arts, and Letters . 
EXPLANATION OF PLATE LXXXXX. 
Fig. 11. Intercellular mycelium. 
Fig. 12. Intracellular mycelium from leaf. 
Fig. 13. Branching hypha tips that will soon begin spore formation. 
Fig. 14. Section of branching end showing the beginning of the gelat- 
ination, of the walls. 
Fig. 15. The mycelium with walls gelatinized, broken up into segments. 
Fig. 16. Some of the segments from a similar stage apparently show¬ 
ing nuclei. 
Fig. 17. Segments, still later, showing nuclei; also young spores with 
nuclei. 
JJstilago Zeae. 
Fig. 18. Mycelium. 
Fig. 19. Segments of mycelium ip spore-forming stage; two of them 
with gelatinized walls. 
Fig.. 20. Young spores showing nuclei. X1800. 
