PLATE I. 
Fig. 1. Polypodium Volga re. A. Magnified fructification of same. 2 P. Dryopteris. 
3. P. Phegopteris. 4. P. Calcareum. 5. P. Alpcstris. 6. Ceteracli Ofiiciuarum. B. Ditto, 
magnified. 7. Gynmogramma Leptophylla. C. Ditto, magnified. 
