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FERNS OF NORTH AMERICA. 233
P la te XX X .
A SP ID IUM T H E L Y P T E R I S , S w a r t z .
M a r sh S h ie ld -F em .
A s p i d i u m T h e l y p t e r i s : — Root-stock slender, elongated,
creeping, blackish, and nearly naked ; stalks scattered, fully as
long as the fronds or longer, blackish at the base, at first
sparingly chaffy, soon smooth ; fronds one to three feet long,
membranaceous, oblong-lanceolate, scarcely narrowed at the base,
short-pointed, pinnate ; pinnæ numerous, short-stalked, spreading
or slightly decurved, tapering from a broad base to a
rather acute or sometimes acuminate apex, slightly pubescent
on the midribs and veins, deeply pinnatifid ; segments oblong-
ovate, usually entire, obtuse ; veins free, the lower ones or all
of them forked near the midvein ; fertile fronds on longer
stalks, and with narrower segments than the sterile ones; son
as near or nearer the midvcin than the margin, which is often
revolute ; indusia minute, reniform, often minutely glandular at
the edge.
Aspidium Thelypteris, S w a r t z , “ in Schraders Jour. ( 1 8 0 0 ) , ii., p. 4 0 ; ”
Syn. Fil., p. 5 0 . — S c h k u h r , Krypt. Gew., p. 5 1, t. 5 2 . — W i l l d
enow , Sp. PL, V., p. 2 4 9 .— P u r sh , FI. Am. Sept., ii., p. 6 6 1 .
— T o r r e y , FI. N . Y . , ii., p. 4 9 6 . — G r -a y , Manual, ed. ii., p. 5 9 7 ,
etc. — M e t ie n iu s , Fil. Hort. Lips., p. 9 2 ; Aspidium, p. 1 1 2 .
M il d e , Fil. Eur. & Atl., p. J i 6 .
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