366 THE CANADIAN NATURALIST. [Sept. 



The six peculiarly American species are: — 



2. Pellsea atropurpurea ! throughout N.A. from south Mexico northward). 

 14. Polystichum acrostichoides (Louisiana eastward and northward). 



17. Noveboracense (North Carolina eastward and northward). 



23. marginale (same range as 17), 



27 Cystea bulbifera (same range as 12). 



32. Woodsia Oregana (Lake Superior to British Columbia, and southward, along the 

 mountains, to California). 



As regards their distribution throughout the world, — 



18 species enter the Arctic circle; 



13 do. extend into the Tropics ; and 



II do. into the Southern Hemisphere. 



8 do. are common to the Arctic circle, Tropics, and S. H. ; 



3 do. are common to the Tropics and S. H. ; and 



2 do. are common to the Tropics only. 



The eight widely spread species are :- 



I. Polypodium vulgare, 



S. Pteris aquilina, 

 10. Athyrium Filix-fcemina, 

 15. Polystichum aculeatum fthe most ubiquitous of all the ferns), 



19. multiflorum, 



22. Filix-mas, 



26. Cystea fragilis (perhaps next to no. 15 in ubiquity), and 

 38. Botrychium ternatum. 



The other five tropical species are :- 



Tropics and S. H. 

 8. Asplenium Trichomanes, 

 16. Polystichum Thelypteris, 

 33. Osmunda regalis. 



Tropics only ; 

 4. Pellsea atropurpurea, 

 39. Botrychium virginianum. 



In addition to the eight above noted, the following ten species 

 enter the Arctic circle : — 



2. Cryptogramma crispa, 

 II. Phegopteris connectile, 



12. Dryopteris, 



13. Polystichum Lonchitis, 

 18. fiagrans, 



28. Cystea montana, 



29. Woodsia Ilvensis, 



30. hyperborea, 



31. glabella, 



35. Botrychium Lunari: 



and probably also the two species of Pellgea, P. gracilis being known 

 from Siberia, and P. atropurpurea being said to be in Dr. Richard- 

 son's collections from " the wooded country, latitude .'54° to 64° 

 north" of British America, and more definitely localized by Sir 

 Wm. Hooker as " Bear Lake." 



The indications of geographical distributions which are appended 

 to the species of Equisetaceae and Lycopodiaceaa have been omitted 



