177 
Brachythecium leucoglaucum C. Muell. & Kindb. Macoun, 
Cat. Can. Pl 198. 1892. 
Gametophyte robust, in wide, loose mats, glossy yellow-green ; 
stems decumbent, arcuate, 5—10 cm. long, stoloniferous at the ends, 
irregularly divided, subpinnately branching; branches erect or 
ascending, 1—2 cm. long, gradually attenuate, terete-foliate to some- 
what complanate-foliate ; branch leaves loosely erect-spreading, 
ovate-lanceolate, very slightly decurrent, 1.5—2 X 0.5-0.7 mm., 
gradually long-acuminate, distantly serrate, slightly concave, 
scarcely plicate; costa extending 24 length of leaf, sometimes 
toothed on the back above ; median cells linear, 15: 1; basal cells 
little differentiated, somewhat shorter; stem leaves broadly ovate, 
more abruptly acuminate, 2—3 X 1—1.5 mm., less strongly serrate ; 
basal leaf cells conspicuously broader and shorter; a few of the 
cells at the extreme angles enlarged and inflated: monoicous or 
rarely polygamous; male branches frequent, cylindric, more 
or less curved; perigonial leaves ovate-lanceolate, gradually 
long-acuminate, denticulate above: perichaetium about 3 mm. 
long; leaves sheathing at base with squarrose points; the inner 
oblong-ovate, rather abruptly narrowed to a very long filiform 
acumination, denticulate above, ecostate, the outer leaves often 
short costate. Sporophyte 2—3 cm. high; seta red-brown, very 
rough throughout; capsule red-brown, oblong, arcuate and hori- 
zontal, not contracted under the mouth when dry, 2.5-3.5 mm. 
long, about 1 mm. thick ; operculum long-conic, apiculate to sub- 
rostellate ; annulus of two rows of cells, persistent; teeth of peri- 
stome red-brown, margined, stout ; segments nearly as long as the 
teeth; cilia 2 or 3, nodose, some often imperfectly developed; 
spores roughened, 13-165, maturing in winter. 
Type locality European. 
On the ground and stones in wet places, less frequently on 
roots and stems of trees and decaying logs. Northern United 
States and Canada; south to New Jersey and Pennsylvania. Co- 
lumbia Falls, Montana (R. S. Williams). 
ILLUsTRATIONS.—Hedw. Descr. 4: pL 72; Br. & Sch. l. c.; 
Wils. Bryol. Brit. ^/. 26 ; Husnot, Musc. Gall. A. 92. 
Exsiccati.—Sull. Musc. Allegh. 45; Sul & Lesq. Musc. 
