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? 1 0 ■ A S P I D I U M F R A G R A « S , S w z . F ig 1 P .H E U O P T E R IS A L P E S T R I S , M e tt .
FERNS OF NORTH AMERICA.
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PiATE X X III . — F ig. i .
PH E G O P T E R IS A L P E S T R IS , M e t t e n i u s .
Alpin e B e e ch -F e rn .
P h e g o p t e r i s a l p e s t r i s : — Root-stock short and thick,
erect or oblique; stalks sub-terminal, four to ten inches long,
bearing a few brown spreading scales near the base ; fronds one
to two feet long, oblong-lanceolate, membranaceous, smooth, pinnate
with delicately bi-pinnatifid deltoid-lanceolate pinnæ, the
lower ones distant, and decreasing moderately ; pinnules ovate-
oblong or oblong-lanceolate, doubly incised and toothed ; sori
small, rounded, naked, usually copious on all or all but the
lowest pinnæ.
Phegopteris alpestris, M e t t e n iu s , Fil. Hort. Lips., p. 8 3 ; Phegopteris,
p. 10.
Polypodium alpestre, H o p p e , “ in Spreng. Syst. Veg., iv., par. ii., p. 320.”—
K och, Syn. FI. Germ., “ ed. 2, p. 9 7 4 ;” ed. 3, p. 7 3 1. — M o o r e ,
Nat. Pr. Brit. Ferns, t. v ii.— H o o k e r & A rno tt , Brit. FL, ed. 7,
p. 582. — H o o k e r , Brit. Ferns, t. vi. ; Sp. Fil., iv., p. 2 5 1 .—
H o o k e r & B a k e r , Syn. Fil., p. 3 1 1 .
Aspidium alpestre, S w a r t z , Syn. Fil., p. 4 2 1 .— S c h k u h r , Krypt. Gew.,
p. 58, t. 60.
Asplenium alpestre, M e t t e n iu s , Asplenium, p. 198. t. vi., figs. 1-6 .
Pseudathyrium alpestre, N ew m an , “ Phytologist, iv,, p. 3 7 0 ; ” Hist. Brit.
Ferns, ed. iii., p. 200.
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