199 
Type specimens examined. This moss is clearly one of the 
velutinum group and is most likely to be mistaken for B. suberythror- 
rhizon or B. collinum; it differs from the former in the smaller, 
shorter leaves and abruptly acuminate perichaetial leaves ; from 
the latter in the more robust habit and the less abruptly acu- 
minate and falcate stem and.branch leaves. The seta often bears 
traces of papillae. The author remarks, 1. c., that “ This species 
rather resembles J£. Solanderi, from which it is distinct by the 
smooth pedicel, monoecious inflorescence, the thicker capsule, the 
larger size and bright green tint of the tufts. It is more closely ' 
allied to the European B. olympicum Jur. from which it differs in 
the larger size, the larger broader plicate leaves, the basal areola- 
tion looser, with angular cells more numerous, quadrate, thin- 
walled, the costa narrower and shorter and the lid obtuse, not 
apiculate.” 
28. BRACHYTHECIUM SUBERYTHRORRHIZON Ren. & Card. Bot. 
Gaz. 19: 238. 1894. 
Gametophyte in thin tricate mats, green; stems creeping, sub- 
pinnately branching; branches 3-5 mm. long, decumbent or 
ascending ; branch leaves oblong-lanceolate, long and slenderly 
acuminate, somewhat falcate, 1—1.2 X 0.3—0.35 mm., strongly 
serrate above, strongly concave or bisulcate, margins reflexed ; 
costa extending beyond the middle ; median cells linear, 10-15: 1 ; 
basal broader and shorter; quadrate alar cells numerous; stem 
leaves oblong-lanceolate to ovate-lanceolate, 1.4 X 0.4-0.5 mm. : 
monoicous ; perichaetium about 2 mm. long; leaves sheathing at 
base with erect-spreading points, ovate to ovate-lanceolate, filiform- 
acuminate, serrate at apex. Sforophyte 12-15 mm. high; seta 
smooth, red-brown; capsule brown, ovoid, suberect to horizontal, 
2-2.5 by 1 mm,, little or not at all contracted under the mouth 
when dry ; operculum conic ; annulus large, easily detachable, often 
coming off with operculum ; segments as long as the teeth; cilia 
I or 2, well developed, nodose ; spores 13, slightly roughened. 
Type locality, Springdale, Boulder Co., Colorado (Mary Hol- 
zinger). Type seen. 
* Nearly allied to B. erythrorrhizon Br. & Sch. from which it 
differs in the narrower leaves and the looser areolation." Also in 
