198 
plicate: monoicous; male branches abundant, perigonial leaves 
ovate, acuminate, I.4—1.6 X 0.6 mm.; costa lacking or faint: 
perichaetium 2.5 mm. long, loosely sheathing ; leaves oblong- 
ovate, abruptly filiform-acuminate, nearly ecostate. Sporophyte 
I.5—2 cm. high; seta red-brown, roughened with rather low blunt 
papillae, little twisted ; capsule light brown, 1.5 mm. long, 1.5-2 : 1, 
short-ovoid, unsymmetric, horizontal ; operculum short conic ; an- 
nulus present; segments as long as teeth, cilia two or three, well- 
: developed, appendiculate; spores smooth, ro-12p, maturing in 
winter or early spring. : 
Type locality, summit of “ Bareknob” Traile River Basin, 
Idaho, alt. 5500 ft. (J. B. Leiberg, 288. July, 1891). 
The gametophyte closely resembles B. ezythrorrhizon, from which 
it differs in the rough seta and in being monoicous. Easily dis- 
tinguished from B. velutinum by the larger stem leaves. 
27. BRACHYTHECIUM IDAHENSE R. & C. Bot. Gaz. 15: 60. 1890. 
Gametophyte in bright green, loosely intricate tufts; stems 
creeping, irregularly pinnate, branches ascending, somewhat curved 
at the ends, about 5 mm. long ; branch leaves loosely erect-spread- 
ing, subsecund, more or less falcate, 0.6—0.9 X 0.3—0.4 mm., ovate- 
lanceolate, acuminate, strongly serrate, concave ; margins reflexed 
below; costa stout, extending 24-34 length of leaf; median 
cells linear-vermicular, 6-8: 1; basal cells broader and shorter, 
alar quadrate ; stem leaves larger, 0.8-1 X 0.35—0.5 mm., lanceo- 
late from an ovate base, long-acuminate, plicate ; basal cells more 
enlarged : monoicous ; perichaetium 2 mm. long, sheathing ; inner 
leaves nearly erect, oblong-lanceolate, very abruptly acuminate, 
serrate, nearly ecostate. Sporophyte 10-17 mm. high; seta red- 
brown, smooth; capsule 1.5-2.5 X 1 mm., ovoid, unsymmetric 
and horizontal ; operculum obtusely conic; annulus large, of two 
rows of cells; segments as long as teeth ; cilia 2, long, nodulose 
to subappendiculate; spores roughened, 10-125 maturing in 
autumn. i 
Type locality, Lake Pend d’Oreille, Idaho, on logs. (Leiberg 
No. 130 in part); also Belt Mts. Montana, November 3, '91 (R. 
S. Williams). 
