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FERNS OF NORTH AMERICA. 237
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Plate X X X I. — F igs. i - 3 -
POLYPODIUM V U L G A R E , L in n æ u s .
Common P o lyp o d y .
P o l y p o d iu m v u l g ä r e ; — Root-stocks chaffy, extensively
creeping and entangled ; stalks scattered, green and herbaceous,
rather slender, naked, two to eight inches long ; fronds
evergreen, sub-coriaceous, smooth, two to ten inches long, ovate-
oblong to oblong-linear, acuminate, pinnatifid almost to the midrib
; segments numerous, spreading, linear-oblong, acute or
obtuse, the lower ones separated by rounded sinuses, the upper
sinuses acute ; margins obscurely crenulate - serrate, less commonly
serrate, or even incised ; veins all free, usually with three
or four veinlets, the lowest anterior veinlets bearing at their
thickened ends the sub-globose sori midway between the midrib
and the margin of the segments.
Polypodium vulgare, L in n æ u s , Sp. P I, p . 1 5 4 4 . — M ic h a u x , FI. Bor. Am.,
ii., p . 2 7 1 . — S w a e t z , Syn. FiL, p . 3 4 . — S ch k u h r , Krypt. Gew.,
p. 1 2 , t. J I .— W il ld en o w , Sp. PL, v ., p . 1 7 2 . — P u r sh , FI. Am.
Sept., ii., p. 6 5 8 . — B ig e low , FI. Bost., ed. iii., p. 4 1 7 . — G r a y ,
Manual, ed. i., p. 6 2 2 ; ed. ii., p. 5 9 0 , t. ix. — M oo re , Nat.
Print. Brit. Ferns, t. i., 11., Hi. (excluding a portion, o f ttui
synonymy). — K och, Syn. FI. Germ., ed. iii., p. 7 3 0 . M e t t e n
iu s , Polypodium, p. 6 1 .— M a xim ow ic z , Prim. FI. Amur., p. 3 3 7 .
— H o o k e r . Brit. Ferns, t. 2 ; Sp. F il, iv„ p. 2 0 5 . — H o o k er
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