220 MACOUN AND BUEGESS ON 



Superior, producing fronds over a foot long and nearly two inches wide. — Macoun. 

 Echimamish River to Oxford House, and Nelson Elver, near Hudson Bay, N W. Territory. 

 — R. Bell. Canada to Hudson. Bay, Bear Lake,~and the Eocky Mountains. — Richardson and 

 Drummoml. Eocks along the Arctic coast from Mackenzie Eiver to Baffin Bay, also in 

 Arctic G-reenland and along the east and north-east coast. — Hook., Arc. PI. 



§ § Stalks not articulated ; fronds glandular-pubescent or smooth, not chaffy. 

 ^ Indusia of a few broad segments, at first covering the sorus. 



4. — "VV. OBTUS.i, Torrey, (Obtuse-leaved Woodsia), Gray, Man., 668. Lawson, Can. Nat., 

 I, 289. Hook, and Baker, Syn. Fil., 48. Ball, Trans. N. S. Inst. Nat. Sci., IV, 154. Macoun's 

 Cat., No. 2330. Eaton, Ferns of N. A., II, 189. Underwood, Our Nat. Ferns, etc.. 111. 



W. Perriniana, Hook, and Grrev. 



PolypocUum obtusum, Spreng 



Aspidium obtimm, Willd., Piirsh, II, 662. 



Hypopeltis obtusa, Torr. 



Cystopteris obtusa, Presl. 



Physematium obtusum, Hook., Fl. Bor.-Am., II, 259. 



Physematium Perrbiianum, Presl. 



This is a non-evergreen species found growing in tufts in rocky places, and reaching 

 a height of 9 inches to 1| feet. Eootstock short, creeping, somewhat chaffy, and covered 

 with old stalk-bases ; stalks green when fresh but stramineous when dry, darkened close 

 to the base, chaffy when young, aboirt half the length of the fronds ; fronds broadly-lance- 

 olate in outline, commonly about 6 to 12 inches long by 2 to 3 wide, delicate, minutely 

 o-laudular-hairy especially on the under side, nearly bipinnate ; pinnae rather distant, tri- 

 angular-ovate or triangular-lanceolate, obtuse, piunately parted into oblong, obtuse, cren- 

 ately toothed segments, the lower of which are pinuatifid ; indusia nearly covering the 

 sporangia at first, but afterM^ard splitting into 4 to 6 spreading, jagged lobes. 



Though not rare in parts of the United States, the only known station for this fern in 

 Canada is near Canning, Nova Scotia, in the gorge through which Dr. Hamilton's Eoad 

 winds up to the summit of North Mountain, where it was found by Mr. Peter Jack of 

 Halifax, who kindly supplied a specimen for examination. The plant credited in " Ferns 

 of North America" to British Columbia as Woodsia obtusa, on the authority of a list of the 

 specimens collected in 1861 on the Galtou Mountains by Dr. Lyall, is not that species, but, 

 as Prof. Eaton recently writes, Woodsia scopulina, while Prof How's plant so called, col- 

 lected at Windsor, Nova Scotia, and now in the provincial museum at Halifax, is only a 

 form of Cystopteris fragUis. 



* * Indusia small, never covering the sori, split into narrow segments or reduced 

 to minute ciliœ. 



5. — "W". SCOPULINA, D. C. Eaton, (Rocky Mountain "Woodsia), Hook, and Baker, Syn. Fil., 

 48. Macoun's Cat., No. 2328. Eaton, Ferns of N. A., II, 193. Underwood, Our Nat. 

 Ferns, etc., 110. 



W. obtusa. Gray, not of Torrey. 



A non-evergreen species usually from 6 to 12 inches high, growing in dense masses 

 on rocks and in their crevices, chiefly in the shade. Eootstocks short, creeping, very 



