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F E R N S OF NORTH AM E R IC A . 2 5 7
P l a t e X X X IV .
A SP ID IUM A CRO ST ICHOID ES , S w a r t z .
C h r is tm a s -F em .
A s p id iu m a c r o s t ic h o id e s : — Root-stock creeping, covered
with adherent stalk-bases ; stalks tufted, several inches long, very
chaffy ; fronds one to two feet long, evergreen, sub-coriaceous, lanceolate
from a scarcely narrowed base, pinnate ; pinnæ numerous,
oblong-lanceolate, short-stalked, more or less upwardly falcate or
the lowest ones slightly deflexed, pointed, abruptly narrowed at
the lower side of the base, auricled on the upper side; margin serrulate
with incurved bristle-pointed teeth, less commonly toothed
or incised; veins free, branching; upper pinnæ of the fertile fronds
contracted ; sori terminal on the lower veinlets, often crowded and
confluent when ripe; indusium orbicular.
Aspidium acrostichoides, S w a r t z . Syn. Fi!., p. 4 4 . — S c h k u h r , Krypt. Gew,
p. 19 3 .— W il ld en ow , Sp. PL, v., p. 22 5.— P u r sh , FI. Am. Sept.
p. 6Ó1.— T o r r e y , FI. New York, ii., p. 497. — G r a y , Manual
ed. ii., p. 599.— M e t t e n iu s , Fil. Hort. Lips., p. 8 8 ; Aspidium, p
42. — H o o k e r , Sp. Fil., iv., p. 9. — H o o k e r & B a k e r , Syn. F il, p
2 5 0 .— W i l l iam s o n , Ferns o f Kentucky, p.99, t. xxxvi.
Nephrodium acrostichoides, M ic h a u x , FI. Bor.-Am., ii., p. 267.
Polystichum acrostichoides, S chott, Gen. Fil. — P r e s l , Tent. Pterid., p. 8 3 .—
G r a y , Manual, ed. i., p. 632.
Aspidium auriculatum, S ch k u h r , Krypt. Gew., t. 30 .
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