189 
Eurhynchium populeum Kindb. Can. Rec. Sci. 1894: 23. 1894. 
Gametophyte in wide, loosely intricate mats, dark green to 
yellowish green; stems 2-5 cm. long, creeping, stoloniferous, 
attached to the substratum by dense fascicles of radicles, subpinnately 
branching ; branches 3-10 mm. long, terete-foliate ; branch leaves 
erect-spreading ; the upper lanceolate ; the lower broadly ovate- 
lanceolate, I-1.2 X 0.25-0.4 mm., slightly decurrent, subulate 
acuminate, more or less concave, nearly entire or finely serrate 
above, margins revolute below; costa stout, extending into the 
apex; median leaf-cells linear-oblong, 5-8: 1; several rows of 
basal and alar cells rhomboidal to quadrate ; stem leaves 1.4-1.8 
X 0.5—0.6 mm.,broadly ovate, slenderly acuminate with apex usually 
more or less contorted, nearly entire, not plicate or sulcate ; leaf- 
cells broader and shorter: autoicous; male branches gemmiform, 
abundant; perigonial leaves ovate, abruptly acuminate ; the inner 
faintly costate and serrate at the apex : perichaetium 1.5-2 mm. 
long ; the leaves sheathing at the base, with spreading points, ob- 
long-lanceolate, rather abruptly narrowed to a subfiliform acumin- 
ation, entire or slightly serrate above; costa well developed. 
Sporophyte 10-15 mm. high; seta red-brown, roughened above 
with low broad papillae, nearly smooth below, (sometimes nearly 
smooth throughout); capsule brown, short-ovoid, unsymmetric, 
horizontal, 2:1; operculum very long-conic ; annulus persistent, 
of a single row of cells; segments as long as the teeth, split be- 
tween the articulations ; cilia stout, variable, 1—3, more or less ap- 
pendiculate ; spores finely roughened, about 15,4, maturing in 
early winter. 
Type locality European. 
On stones, roots and trunks of trees, northeastern United States 
and Canada; Revelstoke, B. C. (Macoun); North Carolina (Brid. 
LE ae 
ILLUsTRATIONS.—Br. & Sch.l. c.; Wilson, Bryol. Brit. ^7. 24; 
Husnot, Musc. Gall. AJ. 94. 
ExsiccATr.—Sull. & Lesq. Musc. Bor. Am. (Ed. 1) 333, (Ed. 
2) 499. Austin, Musc. Appal. 328 ; Macoun, Can. Musc. 441, 
548 (B. nanopes). 
Quite variable in size and shape of iion and robustness of 
