1917] Butters,— Studies in Ferns — Athyrium 195 
Notre Dame Bay, August 22, 1911, Fernald and Wiegand no. 4285; 
rich shaded soil, Torbay, August 21-26, 1901, Howe and Lang no. 
1433; woods, Virginia Water, August 5, 1894, Robinson and Schrenk; 
low damp clearings, Grand Falls, valley of Exploits River, July 20, 
1911, Fernald and Wiegand no. 4283; Me. Weils Cove, Bay of Islands, 
August 24, 1896, A. C. Waghorne no. 29; Birchy Cove, Bay of Islands, 
August 24, 1896, A. C. Waghorne no. 24; damp thickets, Bay St. 
George, August 5-7, 1901, Howe and Lang no. 1006a. 
QUEBEC: eastern granite slopes, Table-Topped Mt., Gaspé Co., 
August 9 and 11, 1908, Fernald and Collins no. 275 (type); alpine 
bogs, Mt. Albert, Gaspé Co., July 21-23, 1906, Fernald and Collins 
no. 273. 
MAINE: moist woods, Princeton, Washington Co., August 3, 1912, 
S. N. F. Sanford (N. E.). 
EE. Adjacent pinnules varying irregularly from one another, 
irregularly lobed and toothed. 
H. Pinnules 5-8 mm. broad, 10-18 mm. long, joined by a broad 
membraneous wing, lobes of the pinnules broad and over- 
ME cs eke ssw on A. angustum forma confertum. 
ATHYRIUM ANGUSTUM forma confertum, forma nov., foliis ac fertilibus 
ac sterilibus consimilibus, pinnis pinnulisque inparibus, pinnis 
basin versus pinnatis, apicem versus pinnatifidis, pinnulis con- 
fertis ad 8 mm. latis, segmentis ordinis tertii imparibus confertis. 
A form of A. angustum corresponding in the irregular cutting and 
overlapping of the broad pinnules to A. Filix-femina var. latifolium 
Babington, but with all the technical characters of A. angustum. 
Apparently this is a somewhat abnormal form without geographical 
significance as appears from the following list of specimens: 
QuEBEC: boggy subalpine woods, altitude 1000 m., Table-topped 
Mt., Gaspé Co., August 13, 1906, Fernald and Collins no. 276 (type). 
New HampsuireE: Hampton Falls, August 5, 1899, A. A. Eaton. 
Massacuusetts: Brockton, September 8, 1907, A. A. Eaton. 
The New England specimens are not so far removed from the 
ordinary var. rubellum as is the Gaspé specimen. 
HH. Pinnules very irregular in size and shape, with many long 
acute teeth which project in various directions. 
A. angustum forma laciniatum. 
ATHYRIUM ANGUSTUM forma laciniatum, forma nov., frondibus ac 
sterilibus ac fertilibus consimilibus pinnulis erosis dentibus 
spinulosis incompositis instructis. 
An abnormal form of fairly frequent occurrence, in which the frond 
looks as if it had been nibbled when young, some of the pinnules being 
wanting or greatly reduced, and all of them tending to show great 
irregularity of form. The teeth of the margins of the pinnules are 
unusually long and acute, and are inclined to stand out in a very irregu- 
lar and disorderly fashion. 
