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A S P I D I U M M U K 1 T Ü M , K a u lf Amatroiq A Co. LIfh E 0 Sion
FERNS OF NORTH AMERICA.
P l a t e XXV.
A S P ID IUM M UN ITUM , K a u l f u s s .
Ch am isso ’ s Sh ie ld -F e rn .
A s p id iu m m u n it u m ; — Root-stock stout, short, asceriding ;
stalks a few inches to a foot long, usually chaffy like the
rachis, with abundant glossy-brown ovate-acuminate scales;
fronds standing in a crown, sub-coriaceous, evergreen, one to
four or five feet long, lanceolate, slightly narrowed at the base,
pinnate ; pinnæ very many, often chaffy beneath, one to four
inches long, linear-acuminate, very sharply and often doubly serrate
with incurved aculeate teeth, auricled at the upper side of
the nearly sessile base, and obliquely truncate at the lower, all
or only the upper ones fertile, but not contracted ; veins free,
once or twice forked ; sori abundant in a row each side the
midrib, also on the auricles, often sub-marginal ; indusium
orbicular, peltate, the margin either entire or incised with hair-
pointed teeth.
Aspidium muniium, K a u l fu s s , Enum. F il, p. 236. — H o o k e r & A rn o t t ,
Bot. Beechey Voy., pp. 162, 405.— H o o k e r , FI. Bor. Am., ü.,
p. 261 ; Sp. Fil., iv., p. 10, t. 219. — M e t t e n iu s , Aspidium, p. 41.
— E aton, Ferns of the South-West, ined.
Polystichum munitum, P r e s l , Tent. Pterid., p. 83. — R u p r e ch t , Dist. Crypt.
Vase. Imp. Ross., p. 39. — B r a c k e n r id g e , Filices of the U. S. Expl.
Exped., p. 203. — E a ton , in Bot. of Mex. Boundary, p. 235.
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