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Pinna of barren Frond—under side.
CYSTOPTERIS TENUIS.
S c h o t t . J . S m it h . M oore a n d H o u l st o n .
P L .4 T E X X X V . VOL . V I I ,
Aspidium tenue,
“ atomarium,
Nephrodium tenue,
Cystopteris fra g ilis , var..
S w a r t z . S c h k u h r . W il l d e n o w .
M u h l e n b e r g . W il l d e n o w .
M ic h a u x .
H o o k e r .
Cystopteris—Bladder Fern. Slender.
I t would be difficult to find a F e rn more appropriatcly
namcd than this species, the fronds are so slender and fragile
that they can scarcely hear th e ir own weight, although the
substance of the frond is remarkably thin. Some authorities
consider it a varicty of Cystopteris fr a g ilis , b u t I th in k there
can h ardly be a doubt as to the two being perfectly distinct
sjiecics.
A half-hardy deciduous Fern.
Native of N o rth America.
The fronds are sub-tripinnatc, and oblong-lanceolate in fo rm ;
pinnules oblong and rath e r ovate, the one n e x t the rachis
being largest; profoundly pinnatifid, with blu n t dentate segments.
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