Hypnum.] BRYACE^. 4Q5 



179. H. Alaskanum, Lesq. & James. Dioecious : plants 

 widely spreading, densely and regularly pinnate and bipinnate, 

 pale green : leaves solid, broadly ovate, obtuse, plano-concave, 

 obscurely bicostate, the borders remotely serrate; areolation 

 vermicular, slightly larger toward the base ; paraphyllia numer- 

 ous, multifid. — Proc. Amer. Acad. xiv. 139. 



H AB. On the ground ; Alaska. 



Compaiable to 11. Schreberl, from which it differs in its densely pin- 

 nate brandies, tlie broader sUglitly serrate leaves, the dark color, etc. 



* * Plants nearly simple., sithterete : leaces closely imbricate 

 when dry: flowers dioecious. 



180. H. stramineum, Dicks. Plants slender, in soft pale 



yellowish green tufts ; stems long, slender, simple or with few 



branches, not ramulose : leaves erect, open, ovate-oblong, obtuse, 



concave, subcucuUate, excavate at the decurrent angles, narrowly 



costate to above the middle ; perichatial leaves taper-pointed, 



the inner serrate at the apex, very thinly costate, not plicate: 



capsule cernuous or horizontal from a short erect collum, oblong- 



cylindi-ical ; lid convex-conical, acute ; teeth short ; segments 



slightly cleft; cilia two, very short, fragile; annulus none. — 



Crypt. Fasc. ii. 6, t. 1 ; Bryol. Eur. t. 617. Amhlystegium 



stramineum., DeNot. 1. c. 137. 



Hab. Peat bogs; White Mountains {Oakes)\ Pocono Mountain, 

 Pennsylvania (Porter). 



181. H. trifarium, Web. & Mohr. Tufts dirty green 

 above, dark brown within, rigid when dry; stems flexuous, 

 drooping or erect, scarcely divided, filiform at base, gradually 

 thicker above : leaves closely imbricate when dry, five-ranked, 

 broadly ovate, obtuse, slightly decurrent, deeply concave ; 

 costa simple, ascending to the middle, or double and shorter; 

 areolation very narrow, small and shorter at the angles ; peri- 

 chffitial leaves loosely imbricate, the inner long-lanceolate, 

 blunt or subacute, narrowly costate, sulcate: capsule small, 

 cernuous and horizontal, oblong-cylindrical with a distinct col- 

 lum; lid convex-conical, reddish; annulus of a triple row of 

 very small cells; peristome as in the preceding. — Schwed. 

 Reise, 177, t. 2 ; Bryol. Eur. t. 618. H. stramineum, var. tri- 

 farium, Schwaegr. Suppl. i, 2. 212, t. 89. Amhlysteginm tri- 

 farium, DeNot. 1. c. 



Hab. Peat bogs, Northern Ohio (Lesquereux) ; Lake Huron; sterile. 



