1917] Butters,— Studies in Ferns — Athyrium 189 
ATHYRIUM ASPLENIOIDES (Michx.) Desv. 
Nephrodium asplenioides Michx. Flor. Bor.-Am. ii. 268 (1803). 
Asplenium Athyrium Spreng. Anleit. iii. 113 (1804). 
Athyrium asplenioides Desv. Prod. 266 (1827), (Mem. Soc. Lin. 
Paris, vi.). 
Icones: Schkuhr, Krypt. Gew. plate 78; Eaton, D. C., Ferns of 
N. A. ii. plate 76, fig. 1-3; Lowe, Ferns Br. and Ex. v. plate 37. 
The following two forms of this species may be recognized: 
B. Pinnules under 15 mm. long, oblong to oblong-linear, obtuse. 
A. asplenioides f. typicum.! 
In the Gray Herbarium all specimens of lady ferns from south of 
the Potomac and Ohio Rivers, and the state of Missouri are of this 
species, and all except those noted below under the forma subtri- 
pinnatum are of this, the typical form. The following are specimens 
of A. asplenioides f. typicum from more northern states: 
Massacuusetts: Waltham, July 27, 1901. W. P. Rich (N. E2); 
Quaker Leonard Road, Brockton, September 8, 1907, A. A. Eaton; 
Sandwich, July 28, 1909, E. W. Sinnott (N. E.). 
RuopE Istanp: Cranston, July 14, 1884, J. F. Collins; near 
Harbor Pond, Block Island, September 13, 1913, Fernald, Hunnewell 
and Long no. 8339; Foster, September 11, 1910, G. S. and K. A. 
Torrey (N. E.); near Swamp Hill Reservoir, Lincoln, August 8, 1885, 
J. F. Collins (N. E.). 
Connecticut: Bridgeport, July 7, 1889, C. K. Averil (N. E.); 
woods north of Cave Brook, Guilford, August 4, 1882, Wm. R. Dudley 
(N. E.); Danbury, July 19-20, 1912, E. J. Winslow (N. E.); without 
locality, D. C. Eaton. 
New York: Bedford Park, New York City, August 14, 1900, 
Percy Wilson; Staten Island, July 28, 1905, Philip Dowell no. 3962. 
PENNSYLVANIA: Lily Lake, Lucerne Co., July 29, 1899, A. A. 
Heller; swamp two miles south of Refton, in Eozoic, September 23, 
1901, A. A. Heller. 
MaryLanpD: Hyattsville, September 12, 1899, W. R. Maxon no. 
310; near Bush River, two miles north of station, September 11, 1902,. 
G. H. Shull no. 369; Cumberland, Howard Shriver. 
District or COLUMBIA: near Hamilton Hill, Washington, Septem- 
ber 22, 1899, W. R. Maxon no. 339. 
Oxto0: without locality, I. H. Lea. 
Missourr: Montevallo, October 17, 1915, B. F. Bush nos. 7897 
and 7897A.; Campbell, September 6, 1910, B. F. Bush nos. 6199 and 
6199A. 
BB. Pinnules about 2 cm. long, triangular lanceolate, pinnatifid with 
oblong obtuse segments.......... A. asplenioides f. subtripinnatum. 
1 See Plate 123, figures 3-4 and 7-10. 
2 (N. E.), in the herbarium of the New England Botanical Club, 
