CANADIAN FILTCINE.i:. 185 



C, lias some of the pinnae pinnatifid at the base into roundish or semi-Innate lobes, 

 which are shorter than the bases of the pinnae from which they have been cut off, and this 

 form of pinna is irregularly scattered over the frond, several undivided ones separating 

 sets of divided ones. 



P. atropwrpwea is a widely distributed but very local fern, occurring in Canada from 

 Ontario westward to British Columbia and northward to Great Bear Lake. Neighbour- 

 hood of Hamilton, Out. — Judge Logic Limestone rocks, Elora, Ont. — C. McPherson. 

 Crevices of rocks at the Whirlpool and Foster's Flats, Niagara Falls, Out. ; abundant at 

 various places in crevices of dry limestone rocks around Owen Sound and Colpoy's Bay, 

 Ont. ; limestone cliffs, Clearwater River, north of Methy Portage, Lat. 5T, N. W. Ter. ; 

 canyon near Buffalo Head Mountain, Rocky Mountains ; crevices of dry rocks between 

 Spence's Bridge and Cache Creek, B. C. — Macoun. Rattlesnake Bluff, Black Canyon, 

 above Ashcroft, B. C. — A. J. Hill. Canada to Bear Lake and the Rocky Mountains. — 

 Richardson and Drvmmond. 



3. — P. densa, Hook., (Oregon Cliff-Brake, Close-set Pelltea), Hook, and Baker, Syn. Fil., 

 149. Macoun's Cat., No. 2290. Eaton, Ferns of N. A., I, 11. Underwood, Our Nat. 

 Ferns, etc., 94. 



Onijchium densum, Brackenridge. 



This fern is evergreen, and found in clefts of rocks, usually at considerable elevation, 

 varying from 4 to 12 inches in height. Rootstocks slender, tangled, and chaffy ; stalks 

 densely tufted, wiry, slender, chestnut-brown, and dull or but slightly polished ; fronds 

 forming usually only about one-fourth of the height of the plant, smooth, ovate or trian- 

 gular-oblong in outline, leathery, and tripinnate, with the pinnre and pinnules densely 

 crowded ; ultimate segments linear, nearly sessile, very acute or mucronate, those of the 

 fertile fronds entire with recurved edges, and those of the sterile (very rarely seen) broader 

 and sharply serrate ; veins mostly simple ; indusia distinct, but very thin and delicate. 



Strangely enough, this plant is, in Canada, restricted to almost the two extremes of 

 our vast territory, viz., Quebec and British Columbia. Found by Prof. Allen on Mount 

 Albert, Shickshock Mountains, Gaspe, Que., in 1881, growing exposed to the sun on the 

 steep walls of raA r ines, at 2,000 to 3,000 feet elevation. — Eaton. Mount Finlayson, Van- 

 couver, Island, B. C. — J". R. Anderson. Abundant on cliffs along the Fraser River, above 

 Tale, and within the Cascade Mountains, B.C., notably at Chinaman's Bluff. — Macoun. 



Genus V.— CRYPTOGRAMME, R.Br., Rock-Brake. 



1. — C. ACROstichoides, R. Br., (American Rock-Brake, Parsley-Fern), Hook., Fl. Bor.- 

 Am, II, 264. Lawson, Can. Nat., I, 273. Watt, Can. Nat., IV, 3(33. Eaton, Ferns of N. 

 A., II, 99. Underwood, Our Nat. Ferns, etc., 92. 



C. crispa, forma Americana, Hook. 



Allosorus acrostichoides, Spreng., Gray, Man., 660. Macoun's Cat., No. 2287. 



A. crispus, Kaulf. 



A. crispus, var. acrosticlwides, Milde. 



Gymnogramme acrostichoides, Presl. 



Sec. IV., 1884. 24. 



