320 MINNESOTA BOTANICAL STUDIES. 



EXPLANATION OF PLATES. 

 All figures of plates are natural size. 



PLATE XLVIII. 



Figures 1,2. Morchella crassipes. 

 Figures 3, 4. Morchella esculenta. 

 Figures 5, 6. Morchella esculenta form conica. 

 Figures 7, 8. Morchella hybrida. 



PLATE XLIX. 



Figures i, 2, 3. Helvella infula. 



Figures 4, 5, 6. Verpa conica. 



Figures 7^ 8, 9. Verpa bohemica. 



Figure 10. Helvella crispa. 



Figures n, 12, 13. Helvella lacunosa. 



Figures 14, 15. Helvella elastica. 



Figure 16. See paper by Miss Jessie Policy on Physalacria. 



PLATE L. 



Figure i. Spathularia clavata. 

 Figure 2. Leptoglossum luteum. 

 Figure 3. Cudonia circinans. 

 Figure 4. Leotia lubrica. 

 Figure 5. Geoglossum hirsutum. 



PLATE LI. 



Figures 1-6. Morchella esculenta. 



Figure i . Longitudinal section ^ nat. size. 



Figure 2. Ascus, x 195. 



Figure 3. Ascus with sixteen spores, x 195. 



Figure 4. Spores, X 387. 



Figure 5. Apex of an open ascus, X 387. 



Figure 6, a. Normal mature paraphyses, X 195. 



Figure 6, b. Young paraphyses, X 195. 



Figure 7. Morchella crassipes^ longitudinal section, ^ nat. size, 



Figures 8-n. Morchella hybrida. 



Figure 8. Longitudinal section, ^ nat. size. 



Figure 9. Ascus, X 195. 



Figure 10. Spore, x 387. 



Figure n. Paraphyses, X 195. 



Figures 12-16. Helvella lacunosa. 



Figure 12. Cross section of stipe, ^ nat. size. 



Figure 13. Paraphyses, X 195. 



Figure 14. Ascus, x 195. 



