90 THE CANADIAN NATURALIST. [April 



The species occurring in North America, excluding Mexico, are 

 five, so far as known at present. 



1. Woodsia alpina. S. F. Gray, Natural Arrangement of 

 British Plants, ii, p. 17. Moore, Nature-printed Ferns, (folio ed.), 

 t. 47. Acrostichum alpinum, Bolton, Fil. Brit. p. 76, t. 42, (1790). 

 Woodsia hyperborea, B. Brown, Trans. Linn. Soc, xi, p. 173, 1. 11. 

 Hook., British Ferns, t. 7 (excellent). Acrostichum liyperboreuirij 



Liljeblad, Stockholm Trans, p. 201, t. 8, (1793). 



Var. glabella. Woodsia glabella. B. Brown in Bich. 

 App. to Frankl. Journ., p. 39. Hook., Fl. Bor. Am. ii., p. 259, 

 t. 237. 



Hab. — Newfoundland to the Bocky Mountains and northward, 

 scarcely occurring in the United States ; the var. from Vermont 

 and New York, to Behring's Straits (Charles Wright). 



American specimens are less chaffy than common European 

 forms, but not otherwise different. W. glabella has no characters 

 to distinguish it Irom W. alpina, for the largest forms occur per- 

 fectly smooth, and the smallest ones are sometimes quite chaffy. 

 W. mbcordata Maximowicz, from the Amoor Biver, appears to 

 be identical with W. alpina. 



2. Woodsia Ilvensis. B. Brown, 1. c. Hook., British Ferns, 

 t. 8. Gray's Manual, ed. 2, p. 596. Acrosticlmm Ilvense, Linn. 

 Nephrodium rvfidulum, Michx., Fl. Bor. Am. ii, p. 269, 



Hab. — New England to Wisconsin, southward along the Alleg- 

 hanies, and northward to Greenland. Lake Winnipeg, Mr. 

 Barnston ; very fine specimens. 



This fern is extremely variable in size and appearance, some- 

 times being scarcely an inch in height, while fine specimens from 

 the Highlands of the Hudson Biver measure nine or ten inches, 

 and grow in dense patches often two feet in breadth. It may 

 always be distinguished from IF. cdpina by its greater chafnness 

 and longer pinnae. 



3. Woodsia Oregana, sp. nov. : casspitosa glabra; stipite 

 inarticulato frondi sub-aaquilongo basi paleaceo ; frondibus elliptico- 

 lanceolatis pinnatis, fiuctiferis duplo longioribus, pinnis alternis 

 oppositisve triangulari-oblongis obtusis pinnatifidis, pinnulis ovatis 

 dentatis obtusis ; lobulis pinnularum primo reflexis sorumque 

 celantibus mox explanatis, venulis saspius furcatis; indusio fere 

 nullo in cilias perbreves moniliformi-articulatas fere ad centrum 

 diviso. 



Hab.— Dalles of the Columbia Biver, Oregon; Major Baines, 



