179 
ends, sparingly radiculose, pinnately branching ; branches 5-15 
mm. long, attenuate at the ends, terete-foliate ; branch leaves rather 
distant, erect-open, long decurrent, ovate-lanceolate, gradually long 
and narrowly acuminate, strongly serrate above, somewhat con- 
cave and plicate, 1.6 X 0.45—0.6 mm., costate to beyond the middle ; 
median cells linear, 10-15: 1; basal and alar cells little differentiated, 
somewhat shorter and broader ; stem leaves varying from broadly 
ovate and rather abruptly acuminate to elongated triangular-ovate 
and gradually long and slenderly acuminate, strongly plicate and 
decurrent, less strongly serrate, often, nearly entire, basal cells 
more differentiated: dioicous; male plants smaller and more 
slender; leaves more distant and narrower; antheridial branches 
large, subglobose; antheridia numerous, large; inner perigonial 
leaves ovate, abruptly long-acuminate, bordered below by a row of 
elongated cells, nearly ecostate; the outer obovate and costate : 
perichaetium 2.5 mm. long; the leaves with sheathing bases and 
squarrose recurved points; inner leaves oblong-ovate, rather 
abruptly long filiform-acuminate, costate. Sporophyte 2—4.5 cm. 
high ; seta red-brown, very strongly papillose ; capsule red-brown, 
2.5 mm. long, 2.5-3: 1, oblong-ovoid, arcuate and horizontal, 
somewhat contracted under the mouth when dry and empty; 
operculum conic-apiculate ; annulus present ; cilia 2 or 3, strongly: 
nodose ; spores roughened, 13-20, maturing in early winter. 
Type locality, British Columbia (Lyall and Douglas.) 
On moist rocks and soil. California, Idaho, Montana and in- 
tervening territory. Not yet reported east of the Rocky Mts. 
ILLUSTRATIONS.—Sull, Icon. Musc. ~/ 76; Mitt. 1. c. 
ExsiccATI.—Sull. and Lesq. l.c. 
Distinguished from B. rutabulu», which it resembles by being 
dioicous and having a much more slender habit. -I h avé examined 
a portion of the type and find that it has long filiform-acuminate 
perichaetial leaves, although this is not in accordance with either 
Sullivant's or Mitten'sfigures. Specimens of B. spurio-rutabulum 
from Burrard's Inlet (Macoun, Can. Musc. 651) contain B, asperri- 
mum mixed with another sterile moss which has very strongly pli- 
cate leaves. Authentic specimens of B. Columbico-rutabulum from 
type collection can be separated from 7. asperrimum by nothing 
excepting that they are said to be monoicous : no male branches 
could be found on any of the plants examined. Type specimens 
