169 
Brachythecium salebrosum Texanum Aust. Bull. Torr. Club, 6: 
ää 4895. 
Gametophyte in glossy yellow-green mats; stems creeping, 
subpinnately branching ; branches subjulaceous, 5-12 mm. long, 
terete-foliate ; branch leaves more closely imbricated and appressed 
than in B. salebrosum, ovate-lanceolate, long acuminate, 1.5—2 X 
0.45—0.55 mm., serrate above, concave, often bisulcate with re- 
flexed margins; costa extending % to 24 length of leaf; median 
cells linear-fusiform, 10-12: I; several rows of basal cells much 
enlarged, quadrate to oblong-hexagonal ; lower stem leaves ovate, 
abruptly narrowed to a long slender acumination, nearly entire, 
2—-2.4 X 0.9 mm. ; areolation much looser; upper stem leaves 
approaching branch leaves in size and shape: monoicous; male 
branches gemmiform; inner perigonial leaves ovate, very long- 
acuminate, entire, ecostate; paraphyses stout, nearly twice the 
length of the cylindric short-stipitate antheridia: perichaetium 
2.25 mm. long; leaves sheathing at base with spreading points ; 
inner oblong-ovate, long acuminate, nearly ecostate and entire. 
Sporophyte 2.5 cm. high; seta red-brown, smooth; capsule red- 
brown, cylindric, nearly erect, slightly arcuate, about 3 mm. long, 
4: 1; operculum conic-rostrate ; annulus (?), cilia 2 or 3, well de- 
veloped, nodulose; spores granulose roughened, 13%. 
Type locality European. 
Dallas, Texas (J. Boll) ; La., Drumm. Musc. Am. (S. States), 
123 “ Hypnum laetum var ?" 
Distinguished from B. oxycladon by being monoicous and by 
the conspicuously enlarged basal cells of the leaves; from B. sale- 
órosum by the longer suberect capsule and leaves scarcely or not 
at all plicate ; from both by its much shorter-acuminate perichae- 
tial leaves. The American form here described is clearly distinct 
from either B. salebrosum or B. oxycladon, and is referred to P. Rotea- 
num on the authority of C. Mueller, who identified a specimen of 
Boll’s collection now in the Columbia Herbarium as B. sale- 
brosum cylindricum Br. & Sch. I have not had authentic Euro- 
pean material for comparison but the plant described answers very 
closely indeed to Limpricht’s description of B. Roteanum (Rab. 
Krypt. Fl. 4%: 72.) The specimen Austin described was from the 
same locality and collector as the specimen identified by Mueller. 
