CATALOGUE OF CANADIAN PLANTS. 275 



This species especially favours rocky, wooded ravines and hillsides, 

 occurring abundantly from the Maritime Provinces to the Lake of the 

 Woods, thence, but very sparingly, to the Rocky Mountains. Gene- 

 rally distributed throughout Nova Scotia. (Ball) Rather common 

 in New Brunswick. (Fowler.'} Not rare in Prince Edward Island. (Bain.) 

 Common in Quebec. (Provancher, McCord, Sheppard, St. Cyr, &c.) Very 

 common in Ontario. (Lawson, Macoun, Billings, Burgess, &c.) Abundant 

 in the Muskoka and Parry Sound districts of Ontario, and along the 

 Dawson Road, Man. (Burgess.) Split Rock Portage, on the Nepigon 

 River, Ont., and in Peace River Pass, Rocky Mountains, Lat. 56. 

 (Macoun.) The Saskatchewan. (Drummond.') 



(3010.) A. spinulosum, Swartz, Schrad. Journ., ii., 38; Syn. Fil., 

 54. Hook., Fl. Bor.-Am., ii., 261. Provancher, Fl. Can., 719. 

 Macoun & Burgess, Trans. Roy. Soc. Can., ii., sect, iv., 206. 



Nephrodium spinulosum, Desv., Ann. Linn., vi., 261. Hook. & Baker, 



Syn. Fil., 275. 

 Lastrea spinulosa, Presl, Tent. Pterid., 76. Lawson, Fern Fl. Can., 242. 



A partially evergreen fern finding its favorite home in thick, 

 especially damp, woods. It is frequent in the wooded districts of all 

 our provinces and ranges northward to Alaska. 



Yar. intermedium, D. C. Eaton, Gray, Manual, Ed. v., 665. 

 Macoun & Burgess, Trans. Roy. Soc. Can., ii., sect, iv., 207. 



Aspidium intermedium, Willd. J, Sp. PI., v., 262. Pursh, Fl. Am. Sept., 



ii., 663. 



Lastrea intermedia, Presl, Tent. Pterid., 77. 

 Aspidium Americanum, Davenport, Am. Nat., xii., 714; Catal., 29. 



This form, which prefers drier woods, has the same range as the 

 type, but is most abundant in Eastern and Central Ontario. 



Var. dilatatum, Hook., Brit. FL ed. I., 444. Macoun & Burgess, 

 Trans. Roy. Soc. Can., ii., sect, iv., 207. 



Aspidium dilatatum, Swartz, Syn. Fil., 420. 



Lastrea dilatata, Presl., Tent. Pterid., 77. Lawson, Can. Nat., i., 281. 



Lastrea spinulosa, Presl, var. dilatata, Lawson, Fern Fl. Can., 240. 



Like the type, it extends from the Atlantic, through the Rocky 

 Mountains, to the Pacific, prevailing most extensively in the Eastern 

 Provinces and British Columbia, where, in places, it forms almost the 

 whole undergrowth. Not very common in Ontario except about Lake 

 Superior. 



