The rootstocks of P. vulgare were used in the art of 
medicine by the ancients: radix tz usu. . (Plin. Hist. 
26: 58.). In Scandinavia they are much appreciated 
by the children, who delight in gathering stensoeta. 
6. MARGINARIA Bory, 1824. 
Rootstock creeping, scaly. Leaves various, lower 
face densely scaly. Sori marginal without indusia. 
1. M. polypodioides (L.) Tm. Piek: 
Lilix s. Polypodium. . . Virginianum. Pluk. 
1696. Alm. 153. Phyt. t. 289. f. 1. 
Acrostichum fronde pinnata. . Gron. Fl. Virg. 
2: 198. 
A. polypodioides L. Sp. Pl. 1068. 
Polypodium incanum Sw. 1788. Prod. 131. Bat. 
Ferns 1: 197. t. 26. f. 2; in Gray Man. 680. 
Clute, Ferns 198. - 
P. polypodioides A. S. Hitchcock, 1893. Rep. 
Missouri Bot. Gard. 156. Underw. in Ill. Fl. 1: 
33; Nat. Ferns 82; in Britt. Man. 7. Waters, 
Ferns 83. 
Marginarta polypodioides Tm. 1895. Torreya 5 : 
ile 
Plants 0.5—2z dm. high; leaves nearly pinnate, cori- 
aceous, thickly covered on the lower side with grayish 
scales. 
On rocks ortrees. 
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