F E R N S OF NORTH AM E R IC A . 2 6 3
P l a t e XXXV.
P T E R IS AQ U IL IN A , L i n n æ u s .
B ra ck en or E a g le -F e rn .
P t e r i s a q u i l i n a : — Root-stock cord-like, blackish, creeping
widely underground ; stalks solitary, erect, rigid, naked,
swollen and discolored near the base, often more than a foot
high; fronds sometimes three feet long and nearly as broad,
triangular-ovate in outline, rigidly sub-coriaceous, smooth or
pubescent, below twice or thrice pinnate; principal primary
pinnæ stalked, the lowest ones very large, the middle and upper
ones rapidly becoming smaller and simpler; pinnules oblong
lanceolate or linear, entire, hastate or pinnately parted;
segments oblong or linear, obtuse, the terminal ones often
elongated; veins close-placed, several times forked, free; involucre
continuous round the edge of the pinnules, very often
double.
Pteris aquilina, L in n æ u s , Sp. Pl., p .15 3 3 .— M i c h a u x , Fl. Bor.-Am., il., p.
262.— S w a r t z , Syn. F i l , p. 100.— S c h k u h r , Kiypt. Gew., p. 87,
t. 95.— W i l l d e n o w , Sp. PL, v., p. 402.— J. G. A g a r d h , Recens.
Pteridis, p. 49.— T o r r e y , FL New Y o rK , ii., p. 448. — G r a y ,
Manual, ed. ¡., p. 624, etc.— M o o r e , Nat. Pr. Brit. Ferns, t.
xliv. — P Io o K E R , Sp. Fil., ii., p .196, & iii., t. cxli, A, B. — M e t t
e n i u s , Pteris, t. xvi., fig. 13 - 1 5 . — M a x im o w i c z , Prim. FL Am-
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