200 
the shorter pointed leaves and in being monoicous. Too close to 
B. Idahense from which it is distinguished by the larger, narrower 
leaves and gradually acuminate perichaetial leaves. 
29. BRACHYTHECIUM COLLINUM (Schleich.) Br. & Sch. Bryol. Eur. 
fasc. 52—54, pl. 548. 1853. 
Hypnum collinum Schleich. Cat. 1815. 
Leskea Fendleri Sull. Mem. Am. Acad. 4: 169. M. T. 1849. 
Hypnum Fendleri Sul. Icon. Musc. 189. pl. 777. 1864. 
Brachythecium Hillebrandi Lesq. Mem. Calif. Acad. 1': 33. 
1868. 
Eurhynchium collinum Kindb. Can. Rec. Sci. 1894: 22. 1894. 
Gametophyte small, slender, in thin intricate mats, bright green 
and glossy above, often dirty green below; stems creeping, radi- 
culose, much branched ; branches erect, slender, usually julaceous, 
often subdivided, 3-6 mm. long, terete-foliate; branch leaves closely 
imbricate, ovate to broadly ovate-lanceolate, 0.3—0.5 X 0.7-0.9 
mm., rather abruptly acuminate, serrulate at base, sharply serrate 
above, concave; costa extending to middle; median cells linear- 
oblong to fusiform, 3-6:1; quadrate alar cells numerous, usually 
chlorophyllose, extending up the margin; stem leaves broadly 
ovate: monoicous ; male branches gemmiform, numerous, borne on 
the branches; antheridia oblong; inner perigonial leaves ovate- 
lanceolate, acuminate, serrate, ecostate: perichaetium 1.8—2 cm. 
long ; inner leaves oblong-ovate, abruptly narrowed to a slender 
acumination, serrate ; costa thin and short or wanting ; upper leaf 
cells linear, the lower broader. Sporophyte 5-12 mm. high; seta 
yellow-brown, smooth or slightly roughened; capsules brown, 
ovoid, unsymmetric to arcuate, contracted below the mouth when 
dry, 2 mm. long, 2:1; operculum. conic; annulus broad, of two 
rows of cells, easily detached ; the segments as long as the teeth, 
lanceolate, attached to a basal membrane of medium width ; cilia 
well developed, one or two, with sometimes rudiments of a third, no- 
dose; spores yellow-brown, very nearly smooth, 10-12/, matur- 
ing in autumn. 
Type locality European. 
On earth and rocks in mountains of western United States and 
