302 BRYACEiE. [Leskea. 



to a blunt apex, concave, recurved on the borders, strongly 

 costate nearly to the apex ; areolation oj^aque, round ; inner 

 perichsetial leaves long-sheathing, loosely areolate, costate : 

 capsule erect, oblong or narrowly elliptical, slightly arched, thin, 

 reddish brown when old ; pedicel li to 2 cm. long; lid conical, 

 blunt at the apex ; teeth linear-lanceolate, distantly articulate ; 

 segments shorter, linear, slender, keeled, and cleft betv/een the 

 articulations, — Spec, Muse, 223, t. 57; Sulliv. Icon, Muse, 123, 

 t. 77. X. nervosa, Sulliv, Muse, Allegh, n. 69. X. microcarpa, 

 Schimp. ; Sulliv, Mosses of U. States, 59. 



Hab. On the roots and lower portions of the trunks of trees in low 

 ground, and reached by inundations; common and variable. 



3, L. nervosa, Myrin. Dioecious : plants in dense dark 

 green or brownish mats ; stems pinnately divided into crowded 

 ramulose branches, either short and erect or long and creeping : 

 leaves close, open when moist, imbricate when dry, often turned 

 to one side, narrowly lanceolate or acuminate from an ovate 

 base, plano-concave in the middle, reflexed on the borders ; costa 

 solid, percurrent ; cells of the areolation small, round-oval, 

 transversely quadrangular at the basilar borders ; inner peri- 

 chjEtial leaves long-sheathing, long-acuminate : capsule oblong- 

 cylindrical, regular, brown ; operculum narrowly conical or 

 short-beaked ; jDeristome short ; outer teeth linear-lanceolate, 

 whitish; segments short, subulate, irregular; annulus narrow. 

 — Coroll. Fl. Ups. 52; Bryol. Eur. t, 472; Sulliv, Mosses of 

 U. States, 105. Pterogonium nervosum, Schwaegr. Suppl. 

 i. 102, t. 28. 



Hab. Trunks of trees; White Mountains, generally sterile; Crawford 

 Notch, fruiting {James); rare. 



4. L. denticulata, Sulliv. Dioecious: plants in small loose 

 light green tufts ; stems short, creeping, irregularly branching, 

 radiculose : leaves close, appressed, open, erect or subsecund, 

 ovate-lanceolate, narrowly short-acmninate, minutely denticulate 

 all around, concave, ecostate, pellucid ; areolation narrowly ob- 

 long, the basilar broader and shorter : male plants unknown : 

 capsule oval-oblong, suberect, short-pedicelled ; operculum short- 

 rostrate from a broad highly convex or conical base; teeth 

 linear-lanceolate, distantly articulate ; segments nearly as long 

 and as broad as the teeth, carinate, cleft between the articula- 

 tions ; cilia none; annulus none. — Muse. Allegh. n. 62, Mosses 



