— 109 — 



B. Leaves patent when dry; those of branches us. denticu- 

 late all around. Monoecious or {B. luteolum) dioecious, r. syn- 

 oecious. 



a. Leaves entire or (at acumen) faintly sinuolate. 

 T.B.mamilligeruni Kindb. cat. Can. m. 



Leaves large narrowly ovate-lanceolate with long subulate 

 filiform-pointed acumen, not or indistinctly recurved below, not 

 densely crowded, nearly spreading when moist; alar cells not 

 well-defined, the few lowest basal short, the others linear; costa 

 vanishing in middle or longer. Perichetial leaves with long 

 filiform point. Capsule suboval or arcuate not large; cilia not 

 appendiculate; nnnulus none; lid mamillate; pedicel long. Tufts 

 yellowish faintly glossy, very dense and radiculose. Stem sub- 

 pinnate; branches faintly compressed. — Wet logs near springs 

 r. Amer. Can. Brit. Col.: Macoun. 



b. Leaves distinctly denticulate. 



aa. Alar leaf-cells small green well-defined. Perichetial 

 leaves obtuse. Dioecious r. fruiting. 



S.B.luleolum C. Mueller. — Hypnum C. M. syn.; Brachythe- 

 fium Kindb.; »B. Isetums Schimper, non Bridel. 



Leaves large with shortish acumen; cells sublinear exc. the 

 alar; costa sometimes reaching into base of acumen. Stem- 

 leaves ovate or ovate-oblong denticulate above and filiform- 

 pointed; branch-leaves ovate-oblong or broadly ovate-lanceolate, 

 denticulate all around. Capsule suboblong arcuate or suberect; 

 cilia not appendiculate; annulus none; lid short-apiculate; pedicel 

 not long. Tufts green often glossy and radiculose. Branches 

 often pinnate. — On calcareous or basaltic rocks, r. on trees, 

 r. Eur. Switzerl., Norway! Germany: Geheeb; Roemer. 



bb. Lowest basal cells nearly uniform and dilated. Peri- 

 chetial leaves acute. Monoecious us. fruiting. 

 9.B.salebrosum Hoffmann. — Hypnum Hoffm.; Brachythe- 

 cium Br. eur.; B. Rotseanum Notaris; B. sericeum Warnstorf; 

 »Hypnum plumosum Hudson*: Lindb. 



Leaves large ovate-lanceolate with subulate us. long and often 

 fihform-pointed acumen, denticulate all around, us. recurved; 

 lowest basal cells large subquadrate, the others Unear-lanceolate; 

 costa us. vanishing near middle. Perichetial leaves us. with a 

 faint costa. Capsule large arcuate; cilia us. appendiculate; 

 annulus narrow subpersistent; lid apiculate or acute; pedicel us. 

 not long. Tufts more or less radiculose, us. pale or dirty 

 green. Stem gen. not pinnate. — On stones and earth or on 



