Hypnnm.] BRYACE^. 399 



when old ; Lranchlets ascending or drooping : leaves close, ojjen 

 or secund, ovate or oblong-lanceolate, concave, narrowed and 

 decurrent at base, very entire ; costa simple, reaching above the 

 middle, or double and short; alar cells few and large, quad- 

 rangular ; inner perichaetial leaves long-lanceolate, plicate : cap- 

 sule brown-orange, arcuate and constricted under the orifice 

 when dry ; lid orange-color ; teeth yellow ; segments scarcely 

 cleft; cilia two or three, a little shorter; annulus none. — Fl. 

 Angl. 429. II. luridum, Hedw. Muse. Frond, iv. 99, t. 38. 

 Limnohium. palustre, Bruch & Schimp. Bryol. Eur. t. 574, 575. 

 Amhhjstefjium palustre^ Lindb. 



Var. hamulosum. Slender, ascending, mud-color; branch- 

 lets few : leaves shorter, hooked, secund : capsule smaller. — 

 Bruch & Schimp, 1. c, as Limnohium. 



Hab. On stones and rocks, in shallow creeks; Vermont {Frost); New 

 Jersey (Austin). The variety in the White Mountains [James); Utah 

 (Watson); Kooky Mountains {Drununond). 



Numerous, mostly alpine, forms of this very variable species are described. 



166. H. molle, Dicks. Tufts loose, very soft, dirty green; 

 stems 5-10 cm. long, slender, flexuous, without radicles, with 

 few sim])le branches : leaves spreading, whether dry or moist, 

 broadly oval, narrowed and decurrent at the point of attach- 

 ment, apiculate, distinctly serrate at the apex ; costa bifurcate 

 or divided, one of the divisions longer; arcolation linear, fusi- 

 form, shorter at the apex, quadrate and orange at the subauricu- 

 late angles ; inner perichsetial leaves long, taper-pointed, serrulate 

 at the apex, costate : capsule short-pedicelled, cernuous, incurved, 

 turgid-oval ; operculum convex, obtuse, short-papillate ; seg- 

 ments entire; cilia one or two, a little shorter, thick ; annulus 

 broad. — Crypt. Fasc. ii. 11, t. 5. limnobium molle, Bruch & 

 Schimp. Bryol. Eur. t. 576, 577. II. Closteri, Austin, Muse. 

 Appal, n. 439. 



Hab. Mountain rivulets; North Carolina, New Jersey, New York, 

 Canada, etc. 



167. H. alpestre, Swartz. Plants more or less densely 

 cespitose, mud-color, only the young shoots greenish; stems 

 prostrate, eradiculose ; branches close, erect, thickish, fastigiate, 

 with few branchlets ; leaves ovate or broadly oblong, obtusely 

 acuminate, often oblique, half-twisted above, obscurely serrulate, 

 slightly decurrent and excavate at the angles ; costa long, bifus- 

 cate from the base, with one of the divisions longer and passing 



