336 BRYACE^. [Hypnum. 



36. H. acuminatura, Beauv. Dioecious : plants widely 

 and more or less densely cespitose, dark green passing to glossy 

 yellow ; stems radiculose, prostrate ; branches distantly ramu- 

 lose ; branchlets two-ranked, unequal, acute, plumose or sub- 

 julaceous : leaves close, erect-open, ovate-acute or ovate-lanceo- 

 late, acuminate, concave, the borders recurved toward the base, 

 subserrulate from the middle upward, not or only slightly 

 striate ; costa vanishing above the middle or below the apex ; 

 angular cells granulose ; inner pericha^tial leaves tapering into 

 a long filiform curved acumen : capsule cylindrical-oblong, 

 erect, equal, rarely subincurved, short-pedicelled ; operculum 

 long, conical-apiculate ; segments punctate; cilia rudimentary; 

 annulus none. — Prodr. 60 ; Muell. Syn. ii. 334 ; Sulliv. Icon, 

 Muse. 187, t. 116. Leskea acuminata^ Hedw. Spec. Muse. 224, 

 t. 56. L. Bei/richii, Hampe, Linnsea, xiii. 47, and Icon. Muse. 

 t. I. 



Var. rupincolum, Sulliv. & Lesq. Branches jiilaceous : 

 leaves densely imbricate, short, carinate and more plicate : cap- 

 sule shorter oblong. — Muse. Bor.-Amer. Exsicc. n. 330"- Les- 

 kea rupincola, Hedw. 1. c. 227, t. 54. 



Var. setosum, Sulliv. & Lesq. 1. c, n. SSO-^- Branchlets 

 slender, plumose, pale yellow : leaves longer Avith looser areola- 

 tion, the perichjetial longer-acuminate : lid long-acuminate, not 

 apiculate. — Leskea setosa, Hedw. 1. c. 226, t. 57. 



Hab. Decayed trunks in woods; the first variety on the ground or on 

 rocks, the last on less shaded trunks. Ranging from Florida to Canada. 



A most variable species, but easily recognized by its characters, espe- 

 cially by its straight capsule, and the peristome without cilia. 



37. H. salebrosum, Hoffm. Monoecious : plants widely 

 cespitose, glossy, whitish or yellowish green ; stems subpin- 

 nately ramulose : leaves close, erect, oi)en, loosely imbricate 

 when dry, ovate-lanceolate, acute or filiform-acuminate, irregu- 

 larly sulcate ; borders entire or subserrulate ; costa reaching the 

 middle or beyond, sometimes forking : capsule short, cernuous, 

 ovate or ovate-oblong, incurved ; pedicel very smooth ; oper- 

 culum conical ; intermediate cilia two, slightly shorter than the 

 segments, articulate ; annulus narrow. — Deutschl. Fl. ii. 74. 

 Il.plumosum, Huds. Fl. Angl. 423 ; Brid. Bryol. Univ. ii. 475 ; 

 Muell. Syn. ii. 358. Brachythecium salebrosum^ Bruch & 

 Schimp. Bryol. Eur. t. 549, 550. 



