320 minnesota botanical studies. 



Explanation of Plates. 

 All figures of plates are natural size. 



Plate XLVIII. 

 Figures I, 2. Morchella crass i pes. 

 Figures 3, 4. Morchella escalenta. 

 Figures 5, 6. Morchella escitlcnta form conica. 

 Figures 7, S. Morchella hybrida. 



Plate XLIX. 



Figures 1, 2, 3. Helvetia infida. 



Figures 4, 5, 6. Verpa conica. 



Figures 7, 8, 9. Verpa bohemica. 



Figure 10. Helvetia crispa. 



Figures 11, 12, 13. Helvetia laci/uosa. 



Figures 14, 15. Helvetia elastica. 



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



Plate L. 



Figure 1. Spathularia clavata. 



Figure 2. Lcptoglossiun luteum. 



Figure 3. Cudonia circinans. 



Figure 4. Leotia. lubrica. 



Figure 5. Geoglossum hirsntum. y 



Plate LI. 



Figures 1-6. Morchella esc?denta. 



Figure 1. Longitudinal section y 2 nat. size. 



Figure 2. Ascus, x 195. 



Figure 3. Ascus with sixteen spores, X 195. 



Figure 4. Spores, X 3S7. 



Figure 5. Apex of an open ascus, X 3S7. 



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



Figure 6, b. Young paraphyses, X 195. 



Figure 7. Morchella crassipes, longitudinal section, j4 nat. size. 



Figures S-11. Morchella hybrida. 



Figure 8. Longitudinal section, ^ nat. size. 



Figure 9. Ascus, X 195. 



Figure 10. Spore, X 387. 



Figure 11. Paraphyses, X 195. 



Figures 12-16. Helvetia lacunosa. 



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



Figure 13. Paraphyses, X 195. 



Figure 14. Ascus, X 195. 



