I CAtALOGOE OP CANADIAN PLANTS. 276 



This species esjiecially favours rocky, wooded ravines and hillsides, 

 occurring abundantly from ihe Maritime Provinces to the Lake of the 

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

 rally distributed throughout Nova Scotia. (Ball.) Eather common 

 in New Brunswick. (Fowler.) Not rare in Prince Edward Lsland. (Bain.) 

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

 common in Ontario. (Lawscm, Macoun, BiUinys, Burgess, kc.) Abundant 

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

 Dawson Eoad, Man. (Burgess.) Split Eock Portage, on the Nepigon 

 Eiver, Ont., and in Peace Eiver Pass, Eocky Mountains, Lat. 56°. 

 (Macoun.) The Saskatchewan. (Drummond.) 



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

 54. Hook,, l-'l. Bor.-Am., ii., 2GL Provancher, Fl. Can., 719. 

 Macoun & Burgess, Trans. Roy. Soc. Can., ii., sect, iv., 20C. 



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



Syn. Fil., 275. 

 Laslrea spintUosa, I'resl, Tent. Pterid., 70. 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. 



Var. intermedium, J). C. Eaton, Gray, Manual, Ed. v., G(J5. 

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



Aspidium intermedium, AMUd. .1, Si>. PL, v., 262. I'ursli, Fl. Am. Sept., 



ii., 663. 

 Laslrea intermedia, Presl, Tent Pterid., 77. 

 A.'pidium Amcricanum, Davenport, Am. Xat., xii., 714; Catal., 29. 



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

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



Var. dilatatum, Hook., Brit. El. ed. I., 444. Macoun & Biu'gess, 

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



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



Lastrea dilalatu, Presl., Tent. Pterid., 77. Lawson, Can. Nat., i., 2SL 



Laslrea spiniilosa, Presl, var. dilatata, Lawson, Fern Fl. Can., 240. 



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

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

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

 whole undergrowth. Not ver}- common in Ontario except about Luke 

 Superior. 



