204 Rhodora [SepreMpeR 
ful search has failed to disclose any vestige of indusium in the Ameri- — 
can material. 4 
As certain intermediate forms occur, it is the opinion of the author 4 
that this plant should be considered a distinct geographical variety 4 
rather than a species. 4 
ATHYRIUM ALPESTRE (Hoppe) Rylands ex Moore var. americanum, q 
var. nov., omnibus frondium segmentis iisdem formae typicae angus- 4 
tioribus, inter se plus distantibus ultimis linearibus, soris minutis 7 
(0.5-0.7 mm. latis) rotundis submarginalibus, soris singulis dente 4 
marginali pinnulae everto tectis, velo nullo. 4 
This variety is found in subarctic and high alpine situations from 9 
Alaska and British Columbia to California and Colorado, also in Gaspé — 
Co. *y Que bec. q 
The following specimens of Athyrium alpestre var. americanum are — 
in the aia Herbari 
Quesec: forming extensive areas in the alluvium of alpine beocta 
easterly ‘ed northerly rig Table-top Mt. Gaspé Co., August 9, 
1906, Fernald and Collins no. 151a; (specimens 9 dm. tall; crevices 
of granite rock, altitude 730-1050 m., easterly and northerly slopes 
Table-top Mt. Gaspé Co., August 9, 1906, Fernald and Collins no. 151. 
Montana: altitude 5500-6000 f., Glacier Basin below Sperry 
Glacier, August 5, 1901, F. K. Vreeland no. 1058. | 
AHO: moist places, Packsaddle — Kootenai Co., August 6, 
S g, M. d Heller, 
YOMING: in glacial drift, Teton Mis. July 26, 1901, Merrill and 
Wilcox no. 1032. 
Coorapo: rocky slopes and rock crevices, summit of North Park 
— isin roe Ried 10, 1903, L. N. Goodding no 
near t of Mt. Rose, : 
J; Gln Linton ii 1160: "7500 i altitude, Mt. Shasta, August 17, 1881, 
C. G. Pringle; 7800 ft. altitude, Mt. Shasta, August 16, 1903, E. B. 
Copeland pear by C. F. Baker) no. 3917; Mt. Shasta, 1877, 
Hooker and Gray; Mt. Shasta, 1897, We} M. Canby no 414. 
WasHINGTON: loose rock, 6000 ft. altitude, Mt. Rainier, August, 
1895, C. V. Piper no. 2111; Mt. Rainier, August 1890, E. C. Smith. 
British CoLuMBta: mountains ns near Ainsworth, Kootanie Lake, 
altitude 6000 ft., July 10, 1890, John Macoun; altitude 5500 ft., 
Fish Creek Valley, August 1906, Butters and Holway; on dry rocks, 
near _ of Mt. Cheops [near Glacier], altitude 8200 ft tt oe 12, 1904, 
E. R. Heacock in Shaw’s Selkirk Flora no. 453; altitude 4400 ft., 
Rogers Pass, August 23, 1904, E. R. Hencock i in Shaw’s Selkirk Flora 
no. 554; Selkirk Range, August 24, 1885, John Macoun; Cascade Mts. 
49° N. lat., 1859, Dr. Lyall. 

