622 (22) Musci. (mosses.) 



* * Dicecious : stems fomentose : capsule erect, regular. 



12. D. montaniiin, Hedw. Compactly caspitose ; leaves bright-green, 

 soft, patent, rather secund, crisped \rhea dry, lanceolate-subulate, serrate on the 

 margin, and papillose on the back at the apex ; costa strong, percuiTent ; cap- 

 sule oblong, sulcate when dry ; annulus double. — On tranks of trees, Goat Isl- 

 and, Niagara PaUs, Lesquereux. (Eu.) 



13. I>. flagcellare, Hedw. Near the last species, but distinct by its nu 

 merous fragile and short erect flageUas, furnished with minute appressed lanceo- 

 late ecostate leaves ; stem-leaves greenish-yellow, more falcate-secund ; the cap- 

 sule longer and narrower. — On decayed logs in woods ; veiy common. (Eu.) 



14. I>. interruptnin, Br. & Sch. Stems l'-2' high; leaves long, 

 secund-falcate, or spreading every way, flexuous, subulately attenuated from a 

 lanceolate base; costa broad, predominant, denticulate at the apex; capsule 

 cylindrical, annulate, dark brown. — On rocks in mountain districts. — A rather 

 harsh, dark-green species, somewhat larger than No. 12 and 13. (Eu.) 



15. D. longifolllim, Hedw. Loosely csespitose, pale-green ; stems 

 elongated, slender, arcuate-ascending ; leaves circinate-secund, very long, fili- 

 formly attenuated, with a remarkably broad costa, denticulate on the margins 

 and the back at the apex; capsule elliptic-cylindrical. — Shaded rocks, Alle- 

 ghany Mountains. (Eu.) 



* * * Dicecious : stems tomentose : capsule incurved-cemuous. 



16. D. SCOpanum, L. Loosely caespitose; stems 2' -4' high; leaves 

 secund or falcate-secund, lanceolate-subulate, carinate-concave, seiTate at the 

 apex ; costa with prominent ridges at the back, dentate above ; capsule cylin- 

 drical, slightly cemuous. — Var. tallidtjm (Muse. Alleghan., No. 155) has 

 narrower leaves, ■nath a looser areolation, the lower areolae not sinuous, the costa 

 with ridges only near the point; pedicel pale yellow. — Alleghany Mountains ; 

 rare. — The variety in districts not mountainous, and very common. (Tab. 



n.) (Eu.) 



17. I>. clong'atum, Schwsegr. Compactly csespitose; stems slender, 

 4' -5' long; leaves lanceolate-subulate, entire, erect-patent; capsule gibbous- 

 ovate, striate, annulate. — High peaks of the Alleghany Mountains : north shore 

 of Lake Superior, Agassis. (Eu.) 



18. I>. congestum, Brid. Loosely csespitose; leaves spreading, sub- 

 secund, flexuous, lanceolate-subulate, denticulate at the apex, crisped when dry ; 

 costa strong, excun-ent; capsule oval-oblong, much incurved, striated. — On 

 rocks, in mountainous districts ; common. (Eu.) 



19. 5>. palustre, Brid. Stems 3'-4' high; leaves spreading, linear- 

 lanceolate, undulated, serrate on the margin and also the back at the apex ; 

 costa slender and vanishing below the point ; capsule oval-oblong, slightly in- 

 curved, striated ; annulus none. — In cranbeny marshes. Northern Ohio, Les- 

 quereux. (Eu.) 



20. D. Scliraderi, "Web. & Mohr. Densely tufted ; stems 3' - 5' long ; 

 leaves crowded, erect-patent, oblong-lanceolate, rather obtuse, undulated, the 

 upper half serrated on the margins and papillose on the back ; costa ceasing 



