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. 
ris, 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 Kr yprtioen obtuse. 
loides £. typicum.* 
In the Gray Herbarium all specimens of ays 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 swtbtri- 
pinnatum are of this, the typical form. The SD nk: are specimens 
of A. asplenioides f. typicum from more northern sta 
Massacuusetts: Waltham, July 27, 1901. W. P Rich ae an 
Quaker Leonard Road, Brockton, September 8, 1907, A. A. 
Sandwich, July 28, 1909, EF. W. —— geo J}. 
Ruope Istanp: Cransto on, July 14, 1884, J. F. Collins; near 
Harbor Pond, Block Island, fen Bie 13, 1913, Fernald, Hunnewell 
and Long no. 8339; Foster, ia 11, 1910, G. S. and K. A. 
Tore, (N. E.); a 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.); aya July 19-20, 1912, E. J. Winslow (N. E); Without 
locality, D. C. E 
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 ‘tiniie September 23, 
1901, A. A. Heller. 
RYLAND: Hyattsville, September 12, 1899, W. R. Mazon 
310; near Bush River, two miles north of station, September 11, 1902, 
G. i. Shull no. 369; Cumberland, Howard Shriver. 
STRICT OF CoLuMBIA: near Hamilton Hill, Washington, Septem- 
ber 22, 1899, W. R. Mazon no. 339 
Onto: Bg locality, I. H. Lea. 
ontevallo, October 17, 1915, B. F. Bush nos. 7897 
and 78074. ‘ Cannbe September 6, 1910, B. F. Bush nos. 6199 and 
6199A. 
BB. Pinnules about 2 0 long, oe lanceolate, pinnatifid with 
oblong obtuse segments.......... A. asplenioides f. sublriptnnatum. 
1See Plate 123, figures 3-4 and 7— 
2 (N. EL), Cae ekki or as Wee Waighusl ethatiad Cdeb. 
