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FERNS OF NORTH AMERICA. 157
P la t e XX I.
PH E G O P T E R IS D R YO P T E R IS , F é e .
Oak-Fern.
P h e g o p t e r i s D r y o p t e r i s ; — Root-stock slender, cord-like,
widely creeping ; stalks scattered, slender, chaffy near the base,
six to twelve inches high ; fronds thinly herbaceous, smooth,
deltoid, four to ten inches wide and long, ternate ; primary divisions
stalked and widely divergent, pinnate with usually opposite
linear-oblong pinnæ, which are pinnately lobed or divided ; lobes
oblong, obtuse, slightly curved, entire or crenated, in very large
fronds those of the middle division again pinnatifid ; veins pinnately
branched; sori rather small, seated in the back of the
veinlets near the margin of the lobes.
Phegopteris Dryopteris, Fée, Genera Filicum, p. 2 4 3 . — M e t t e n iu s , Fil.
Hort. Lips., p. 83 : Phegopteris, p. 9. — E aton, in Gray’s Manual,
ed . V., p. 6 6 3 . — M i ld e , I*il. Eur. et Atl., p. 98.
Polypodium Dryopteris, L in n æ u s , Sp. PL, p. 1 5 5 5 . — S w a r t z , Syn. Eil., p.
4 1. — S c h k u h r , Krypt. Gew., p. 19, t. 25. — T o r r e y , FI. New
York, ii., p. 485.'— R u p r e c h t , Dist. Crypt. Imp. Ross., p. 5 2 .—
G r a y , Manual, ed. i, p. 623, etc. — H o o k e r , Briti.sh Ferns, t. 4 ;
Sp. Fil., iv., p. 250. — H o o k e r & B a k e r , Syn. Fil., p. 309 (excl.
var. Pobcrtianum).
Nephrodium Dryopteris, M ic h a u x , FI. Bor. Am., ii., p. 2 7 0 .
Polystichum Dryopteris, R oth, E'l. Germ., iü ., p . 3 0 .
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