15, ATHYRIUM Roth, 1800. 
Athyrium (a vocabulo abvpos dertvatum) Roth, Cat. 
Botanic. 2: 143. 
Robust ferns. Rootstocks creeping, usually covered 
by the persistent leaf-bases. Leaves pinnate to 3-pinna- 
tifid. Sori more or less curved. 
{| Leaves pinnate. 
1. A, pycnocarpon (Spreng.) Tm. 
Lonchitis maxima foliis plants 7. e. non dentatis 
&éc. Banist.; Ray, Hist. 2: 1927. 
Asplenium angusttfolium L. C. Rich.; Michx. 
Fl. 2: 265, not Jacquin, 1786. Aaton, Ferns 2: 
73. t. 56. ff. 1-3; inGray Man. 685. Underw. 
in Ill. Fl. 1: 24; Nat. Ferns 105; in Britt. Man 
12. Clute, Ferns 187. Waters, Ferns 159. 
A. pycnocarpon Spreng. 1804. Anleit. 3: 112. 
Athyrium pycnocarpon Tm. 1906. Elys. Mar. 36 
WOODFERN. 
Plants 5-9 dm. high; pinnae on the sterile leaves stipi- 
tate, oblong-lanceolate, 2~9 cm. long, 0.5—1.5 cm. wide; 
fertile pinnae 1-6 cm. long, 6 mm. wide or less. 
In rich woods; rather rare. 
Summer. 
{Tt Leaves 2-pinnatifid. 
2. A. thelypteroides (L.C. Rich.) Desv. 
Asplentum acrostichotdes Sw. Schrad. Jour. Bot. 
1800: 2 pt. 54. Underw. in Ill. Fl. 1: 26; in 
Bertil es 12. 
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