150 
nate, entire, slightly concave, ecostate, or costa very faint, short and 
double; leaf-cells linear-rhomboidal ; median cells 8: 1 ; quadrate 
alar cells few; stem leaves broader, more abruptly acuminate : 
antheridia oblong ; perigonial leaves broadly ovate-lanceolate, en- 
tire, acute to acuminate: perichaetium 2 mm. long; the leaves 
loosely sheathing, squarrose at apex; inner oblong-lanceolate, 
more or less long-acuminate, more or less serrate at apex, ecos- 
tate; cells linear above, rhomboidal and hyaline below. Sporophyte 
I~2 cm. high ; seta red-brown ; capsule lighter red-brown, oblong- 
cylindric, 2.5 mm. long, 3.5-4: I, often stomatose at base; oper- 
culum conic to conic-apiculate ; annulus very narrow and easily 
detached, of one row of cells; teeth of peristome linear-lanceolate, 
closely and regularly articulate, sub-moniliform and slightly 
granular above; segments as long as teeth, linear-lanceolate, 
strongly carinate, more or less split when old, granular-roughened ; 
spores brownish yellow, minutely roughened, 1454 maturing in 
autumn and winter. 
Type locality European. 
On stems and roots of trees. Not common. 
Canada and northwestern United States (Macoun); Kakabeka 
Falls, Ont. (Mrs. Britton); Saskatchewan and Rocky Mountains 
(Bourgeau); Santa Fé (Fendler); White Mountains (James); Mon- 
tana (R. S. Williams); Pike’s Peak, Colo. (S. L. Clarke); Minne- 
sota (F. F. Wood); Mt. Desert (Rand, Flora Mt. Desert, 212). 
Apparently widely distributed in Canada and along the northern 
border of the United States in mountainous regions, but rather in- 
frequent and local. 
IrrusrRATIONS.—Dill. Hist. Musc. pl. 42. f. 62 (Hypnum 
sericeum ramosius et tenuis); Hedw. St. Cr. 4: pl. 2. (Leskea poly- 
anta) Br. & Sch. 1. c.; Husnot. Musc. Gall. AJ. 89 ; Rab. Krypt. 
PL. : 
Exsiccat1.—Drumm. Musc. Am. 222; Aust. Musc. Appal. 
Suppl. 1. 537; Macoun, Can. Musc. 260 (in part). 
The typical American form ot this species is quite variable in 
leaf characters even on the same plant, but it differs constantly 
from European specimens in that the leaves are shorter, more 
abruptly acuminate and more broadly ovate-lanceolate. The 
length of the leaf of the European form averages I.5 mm., that 
