Synopsis of Canadiaii Ferns and Filicoid Plants. 281 



around the margins of the pinnules. First observed in the Isle of Elba 

 (Ilva), hence named, after Dalechamp, Acrostichum Ilvense by Linnaeus, 

 whose Phoenix was very wroth thereat ; see English Flora, vol. iv. 

 p. 323. Woodsia Ilvensis, R. Br., Hook., Moore, J. Sm., Gray, &c. 

 Nephrodium lanosiim, Michx. — Abundant on the ridge of Laurentian 

 rocks at Kingston Mills ; Rocks west from Brockville and at Chelsea, 

 B. Billings, jr. ; Mount Johnson and Beloeil Mountain, P. W. Maclagan, 

 M.D. ; mountain gneiss rocks, opposite Rouge River, W. S. M. D'Urban. 

 I have likewise specimens from the Hudson's Bay territories (Governor 

 M'Tavish), but without special locality. On rocks, Canada, Pursh ; 

 Canada to Hudson's Bay, Hook. Fl. B. A. ; Pied du cap Tourmente, M. 

 L'Abbe Provancher. I think our plant must be much larger and more 

 scaly than the European one. A tuft which I have from Catskill Moun- 

 tains (A. 0. Brodie) has richly fruited fronds a foot long and 2 inches 

 wide. (I find that large American forms of this species have been mis- 

 taken for W. obtusa. The involucre, which is large and not split into 

 hairs in the latter species, serves readily to distinguish it.) Much of the 

 Ilvensis in cultivation in Europe is probably the American form. 



/3. gracilis. — Frond more slender, more hairy and less scaly than the 

 type ; pinnoe rather distant, deeply pinnatifid, or partially pinnate. 

 Dartmouth River, Gaspe, John Bell, B.A. In technical characters, this 

 form agrees better with W. alpina (hyperhorea), but it has quite a dif- 

 ferent aspect. 



W. alpina, S. F. Gray. — Frond small (from 1 to 2 or 3 inches long), 

 broadly linear, pinnate, somewhat hairy without distinct scales ; pinnae 

 ovate, somewhat triangular, obtuse, pinnatifidly divided into roundish 

 lobes. Woodsia alpina, S. F. Gray, Brit. PI , Moore. Woodsia hyper- 

 horea, R. Br. in Linn. Trans., vol. xi. ; Pursh. Fl Am. Sept. ii. p. 660. — 

 In the clefts of rocks, Canada, Pursh ; Canada to the Saskatchewan, 

 Hooker. Noticed in Dr Hooker's Table of Arctic Plants as a Canadian 

 species that does not extend into the American States. 



W. glabella, R. Br. — Frond a few (2-4) inches long, linear, bright- 

 green and glabrous on both sides, simply pinnate ; the pinnae short, 

 rounded or rhombic, cut into rounded or wedged lobes. Stipe with a few 

 scales at the base only. Woodsia glabella, R. Br., Hook. Fl, Boreali 

 Americana, tab. 237 ; Gray. Canada, Professor Woods in CI. Bk. 

 Sir W. Hooker, in the Fl. B. Amer., gave Great Bear Lake as the only 

 station then known for W. glabella. Mr D. C. Eaton has kindly 

 furnished me with specimens from Willoughby Lake, Vermont (Goodale 

 leg.), and Professor Gray notices its occurrence on rocks at Little Falls, 

 New York (Vasey), and " high northward." 



(3. Belli. — Frond larger (6-7 inches long) ; pinnae more elongated, 

 pinnatifidly incised into rounded lobes (bright green, glabrous). Gaspe, 

 on the Dartmouth River, twenty miles from its mouth, John Bell, B.A. 



W. obtusa, Torrey.— Frond nearly a foot long, linear-lanceolate, 

 glandulose, bipinnate; pinnules slightly decurrent, oblong, obtuse, crenate, 

 or somewhat pinnatifid ; indusium large, enveloping the sorus, torn into 

 a few marginal lobes ; stipe with few scattered, pale, chaify scales, 

 Woodsia obtusa, Torrey, A. Gray, J. Sm. Aspidium obtusum, Willd. 

 Physematium obtusum, Hook. Fl. Bor. Am. Woodsia Perriniana, 



