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l ô ô F E R N S OF NO R TH AM E R IC A .
eighteen articulations. The spores are ovoid and minutely
muricatcd, or sometimes apparently wing-margined, though
it is difficult to say whether the wing is not partly an optical
effect.
In its general form this fern has a good deal of resemblance
to small forms of W. obtusa, to which it was
referred by Sir J. VV. Hooker. The rudimentary indusium,
however, clearly separates it from that species. In the “ British
Ferns ” of the same author, mention is made of specimens
of W. hyperborea collected at the Dalles of the Columbia
River by Major Raines of the United States Army. These
are a part of the specimens on which the present species was
founded, and on account of which it received its specific name
of Oregana. It has not the imperfectly articulated stalk seen
in the original species of Woodsia described by Robert Brown,
and the indusium, though patterned like that of W. Ilvensis
and hyperborea, is far less conspicuous.
Plate LX I., Fig. 1 - 4 .— Woodsia Oregana, from the Utah specimens.
Fig. 2 is an enlarged pinna. Fig. 3, a sorus. Fig. 4, a spore.
F E R N S OF NORTH AM E R IC A .
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P l a t e LX X I.—F ig .- 5 -8 .
WOODSIA O BTUSA, T o r r e y .
Ob tuse-le aved W o od s ia .
W o o d s i a o b t u s a :— R o o t-s to ck s h o r t ; s ta lk s s tr am in e ous,
ch affy when y o u n g , two to s ix inch es lo n g ; fro n d s e igh t
to fifteen inch es lon g , b ro ad ly lanceolate, memb ranaceo-h erb a-
ceous, m in u te ly g la n d u la r , p innate o r n e a r ly b ip in n a te ; p innæ
ra th e r remote, sho rt-stalk ed, ob tuse, the low e r ones tr ian g u la
r-o v a te , middle ones lo n g e r and n arrowe r in ou tline , all
p in n a te ly p ar ted ; s e gm e n ts o b long , obtuse, c ren a te ly toothed,
the low e r ones p in n a te ly incised w ith toothed lob es ; v e in s
p inna ted and fo rking , fre e ; so ri d o r s a l and sub te rm in al on
the v e in le ts , ne a rer the m a rg in than the m id v e in ; in d us ium
a t fir s t su b g lo b o se , a fte rw a rd s s p lit t in g into a few sp re a d in g
con c a v e too thed lobes.
Woodsia obtusa, T o r r e y , Catal. PI. in Geol. Rep. of New York (1840 )
Fl. of New York, ii., p. 500. — H o o k e r , Sp. Fii., i., p. 6 2 .—
Garden Ferns, t. 4 3 .— G r a y , Manual, ed. i., p. 629; ed. ii.,
p. 595, t. xii. — D a r l in g to n , Fl. Cestr., ed. iii., p. 39 5 .—
M e t t e n iu s , I'il. Hort. Lips., p. 98. — E aton, in Chapman’s FL,
p. 596.— L.-w s o n , in Canad. Naturalist, i., p. 289.'— H o o k er
& B a k e r , Syn. Fil., p. 48. — W il l iam so n , Ferns of Kentucky,
p. 1 1 3 , t. xliii ; Fern-Etchings, t. lii.
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