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FERNS OF NORTH AMERICA.
P l a t e X.
A S P ID IUM N E V A D E N S E (n . s p .).
S ie r ra Sh ie ld -F e rn .
A s p id iu m N e v a d e n s e : — Root-stock rather short, creeping,
densely covered with the persistent bases of former stalks ; fronds
standing in a crown, one and a half to three feet high, thin-
membranaceous, lanceolate in outline, pinnate ; pinnæ sessile,
linear-lanceolate from a broad base, deeply pinnatifid, the lower
pairs distant, and gradually reduced to mere auricles ; lobes
crowded, oblong, entire or sparingly toothed, slightly hairy on the
veins beneath, and sprinkled with minute resinous particles ;
veins about seven pairs to a lobe, simple, or a few of the lower
ones forked ; sori close to the margin ; indusium minute, reniform,
furnished with a few dark-colored marginal glands, and
bearing several long straight jointed hairs on the upper surface.
Aspidium Nevadense, E a ton, Ferns of the South-West, ined.
H a b . — In moist meadows and along creeks in the Sierra Nevada of
Northern California, especially in a meadow containing also the Darling-
tonia, near Quincy, Plumas County, Mrs. R. M. A u st in and Mrs. P u l s if e r
A m e s ; also in Berry Creek Canon, Butte County, Mrs. A m e s .
D e s c r i p t io n . — Except in the nature of the root-stock, and
the consequent position of the fronds, standing in a crown, this
fern has a very close resemblance to the New-York shield-fern.'
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