I ' I .
Plate LXXVr
Armistron^ &. Co.Lith Bostf»
ADIANTUŸ TENERUM, Swariz.
F E R N S OF NO R TH AM E R IC A .
P l a t e LXXVII.
A D IA N TUM T E N E R U M , S w a r t z .
Brittle Maidenhair.
A d i a n t u m t e n e r u m ; — Root-stock rather stout, creeping,
knotted; stalks often a foot long, erect, wiry, terete, smooth,
nearly black and very lustrous, as are all the divisions of the
rachis; fronds as long as the stalks, broadly deltoid-ovate in
outline, thrice or four times pinnate at the base; pinnæ of
every degree stalked, the lower primary ones having very
long stalks; ultimate pinnules usually eight to ten lines long,
smooth, membranaceous but elastic, rhomboid, the base cuneate
or obtuse-angled and articulated to the disk-like apex of the
ultimate petiole, the upper and outer margins more or less
lobed, and in the sterile fronds denticulate, the veinlets extending
to the points of the teeth; fertile fronds having the
ends of the lobes recurved and forming numerous short-
oblong or somewhat lunate or often slightly two-lobed involucres.
Adiantum tenerum, S w a r t z , “ Fl. In d . Occ., iii., p . 1 7 1 9 : ” S y n . Fil., p.
1 2 5 .— W i l l d e n o w , Sp. Pl., v., p. 450.— P r e s l , Tent. Pterid.,
p. 1 5 9 .— L tN K , P 'il. Plort. Berol., p. 7 1 .— H o o k e r , Sp. Fil., i i. ,
p. 45.— M e 'i t k x i u s , Fil., Hort- Lips., p. 48.— G r i s e b a c h , P'l.
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