£ 
165 
Not dendroid ; leaves slender pointed. * 
Stem leaves lanceolat 25. B. velutinum. 
Stem leaves ovate to PERE ate. 
Monoicous. 
Cilia not appendiculate; plants robust, isse green 
| uw. labaha 
Cilia appendiculate ; less robust, green 
Stem leaves narrowly ovate. 26. B. Leibergii. 
Stem leaves broadly ovate. 23. B. Starket. 
Dioicous. 
Leaves 0.6—0.8 mm. long. 32. B. Bolanderi. 
Leaves at least 1.2 mm. long. 
Branch leaves decurrent, yhp serrate. 
JB. asperrimum. 
Branch leaves not decurrent, dendi denticulate. 
12. B. lamprochryseum. 
HM 
BRACHYTHECIUM SALEBROSUM (Hoffm.) Br. & Sch. Bryol. Eur. 
fasc. 52-54. pl. 549. 1853. 
Hypnum salebrosum Hoffm. Deutschl. Fl. 2: 74. 1795. 
Hypnum plumosum salebrosum C. Muell. Syn. 2: 359. 1851. 
Brachythecium laevisetum Kindb. Bull. Torr. Club, 17: 279. 
1890. 
Gametophyte in wide ion yellow-green mats; stems 5 cm. 
or more long, creeping and radiculose, irregularly to subpinnately 
branching ; branches terete-foliate or seldom complanate-foliate ; 
branch leaves lanceolate, 1.8—2.3 X 0.5—0.65 mm., long-acuminate, 
serrate above, very concave, bisulcate; costa extending beyond 
the middle ; median cells linear-vermicular, 10: 1 ; basal cells much 
~ shorter and broader; alar quadrate, thin walled ; stem leaves ovate- 
lanceolate, nearly entire, 2—2.5 by 0.8-1.1 mm. : monoicous ; male 
branches gemmiform, borne on the stem; perigonial leaves 
ovate-lanceolate, acuminate; antheridia oblong-clavate, sessile: 
perichaetium 2 mm. long; the leaves sheathing at base with 
spreading points ; the inner rather abruptly narrowed into a long 
filiform acumination, entire or distantly serrate above, costa nearly 
obsolete. 
Sporophyte 1—2 cm. high; seta red-brown, smooth; capsule 
red-brown, 2.5-3 mm. long, 2.5-3: 1, oblong-ovoid, usually 
* B. lamprochryseum sometimes assumes a dendroid habit. 
