175 
ExsiccaATI.—Macoun, Can. Musc. 285. 
Distinguished from 4. salebrosum, B. acutum and other closely 
allied species by being dioicous and by its very slender pointed and 
entire leaves. B. glareosum which has not yet been found in 
America is also dioicous but is much more robust and its slender 
pointed leaves are strongly serrate. P. pseudo-albicans Kindb. from 
the type collection, is a form with leaves rather shorter acuminate, 
occasionally bearing a very few inconspicuous teeth and with a 
rather larger number of quadratealar cells. The leaves, however, 
are not more denticulate than is sometimes the case with European 
specimens. 
7a. BRACHYTHECIUM ALBICANS OCCIDENTALE R. & C. Bot. Cen- 
tralbl. 44: 422. 1890. 
More slender, more loosely foliate ; leaves subsecund, shorter 
acuminate, denticulate. Montana (Roll.) 
8. BRACHYTHECIUM PSEUDO-COLLINUM Kindb. Macoun, Cat. Can. 
Pl. 6. 196. 1892. 
Gametophyte in loosely intricate, dark green mats ; stems creep- 
ing, subpinnately branching, radiculose; branches about 5 mm. 
long, terete-foliate, branch leaves erect-spreading, 1—1.2 X 0.3-0.4 
mm., very slightly decurrent, lanceolate, concave, serrate ; margins 
reflexed at base; costa extending to middle; apex acute, slender, 
twisted ; median cells linear, 8-10: 1; basal shorter and broader, 
alar quadrate ; stem leaves ovate-lanceolate, more loosely areolate, 
less strongly serrate, slightly bisulcate, 1.4—1.6 X 0.6 mm: monoi- 
cous ; perichaetium about 2 mm. long, sheathing ; inner leaves 
ovate-lanceolate, costate, rather abruptly narrowed to a long fili- 
form acumination, nearly entire, very loosely areolate, leaf-cells 
130 X 234. Sporophyte, 15 mm. high; seta smooth, red-brown ; 
capsule brown, ovoid-cylindric, 2 mm. long, 2-2.5 : 1, slightly un- 
symmetric, suberect; operculum long conic, annulus lacking ; 
segments as long as the teeth; cilia well developed, 1 or 2, strongly 
nodose or subappendiculate ; spores 16y, strongly papillose. 
Type locality under a well platform, Canaan Forks, N. B. (J. 
Moser); type seen. Also collected at Closter, N. J. (Austin). 
