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Plate LVI. — Fig. 1-3.
A S P L E N IU M A N G U ST IFO L IUM , A I i c h a u x .
Narrow-leaved Spleenwort.
A s p l e n i u m a n g u s t i f o l i u m : — Root-stock creeping, bear-
ing crowded blackened stalk-bases and abundant rootlets,
chaffless; stalks clustered, smooth, green, fleshy-herbaceous, a
foot high or less; fronds two to three feet long, lanceolate,
tapering both ways from the middle, membranaceous, smooth,
simply pinnate; pinnæ numerous, short-stalked, lanceolate-
acuminate, two to four inches long, obscurely crenulate, very
minutely serrulate on the hyaline edge ; those of the sterile
fronds half an inch wide, sub-cordate at the base; those of
the taller fertile fronds much narrower, obtuse or truncate at
the base; veins once or twice forked; sori very many, crowded,
oblique to the midrib, slightly recurved, indusium rather
firm, slightly convex, at length hidden by the confluent sporangia.
Asplenium angustifolhuii, Michaux, Fi. Bor.-Am., ii., p. 265. — Swartz,
Syn. Fil., p. 76.— Schkuhr, Krypt. Gew., p. 63, t. 67, 69.—
WUULDENOW, Sp. Pl„ V., p. 313.—PUESII, FI. Am. Sept., ii.,
p. 666. — Toerey, FI. New York, ii„ p. 99. — Ge.a¥, Manual,
ed. i.. p. 627, etc. — Mettenius, Asplenium, p. 99. — Hooker,
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A S P L EM U M ANGUSTTFOLTUM, Mici«. .ASPIEFHUM GICU'IAEGUM, Swaiiz.
AmisiTOr4&.Cü.l-.itIi Boston.
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