220 MACOUN AND BtJEGESS ON 



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

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

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

 Drummond. Rocks along the Arctic coast from Mackenzie River to Baffin Bay, also in 

 Arctic Greenland and along the east and north-cast coast. — Hook., Arc. PL 



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

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



4. — W. obttjsa, Torre//, (Obtuse-leaved Woodsia), Gray, Man., 068. 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 Grev. 



Polypodium obtusum, Spreng 



Aspidium obtusum, Willd., Pursh, II, l!i;2. 



Hypopeltis obtusa, Torr. 



Cystopteris obtusa, Presl. 



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



Physematium Perrinianum, Presl. 



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

 a height of 9 inches to 1 J feet. Rootstock 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, about 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 

 glandular-hairy especially on the under side, nearly bipinnate ; pinnre rather distant, tri- 

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

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

 sporangia at first, but afterward 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 Road 

 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 Galton 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 fragilis. 



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

 to minute cilue. 



5. — W. scoI'tjlina, 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 ereA T iees, chiefly in the shade. Rootstocks short, creeping, very 



