674 musci. (mosses.) 



$ 15. HYPNUM Proper. — Stems procumbent or ascending, irregularly divided, 

 with a more or /ess densely pinnate ramification, sparingly villous: leaves ovate-lan- 

 ceolate, more or less long-acuminate, usually subsecund or falcate-seeund, obsoletely 

 bicoslute, membranaceous, shining ; cellules linear, compact : capsule annulate, 

 mostly oblong and erect-cernuous : operculum conic, more or less rostellate. 



40. II. BSboSBsascBiEii, Iltdw. Dioecious ; grows in soft mats ; stems 

 procumbent cr ascending, diehotomously divided ; the divisions very closely 

 and pinnately ramulose, much as in No. 45 ; branchlets incurved at their 

 points ; leaves suddenly lanceolate-attenuate from a broad base, falcate-seeund, 

 serrate ; capsule horizontal, turgid-oval. — On rocks and on the ground, in dense 

 woods; mostly in mountainous regions. (Eu.) 



47. SI. cupB'essifoB'iBM.', L. Dioecious ; stems creeping, irregularly or 



subjiinnatcly ramulose ; leaves broadly oblong-lanceolate, attenuated, often ser- 

 rulate at the point, falcate-seeund ; capsule oblong or cylindrical, erect-cernu- 

 ous ; annulus broad ; operculum convex-conic, more or less acutely rostellate. 

 — Hilly districts, on the trunks of trees, rocks, or on the ground, in shaded 

 places. — Very variable. (Eu.) 



48. SI. BBlipoiBCBBS, Hcdw. Dioecious; stems prostrate, extended, di- 

 vided, regularly and closely pinnate ; leaves broadly ovate-lanceolate, long-acu- 

 minate, falcate-seeund, sharply serrate at the point, the margins below reflexed ; 

 capsule cylindrical, suberect, slightly incurved. — On the ground, and on de- 

 cayed logs ; forming extensive thin mats, in localities not mountainous. — One 

 of our most common species. (Eu.) 



49. IS. B'eptilc, Michx. Monoecious ; stems slender, creeping, elongated, 

 subpinnately ramulose ; leaves ovate-oblong, moderately acuminated, subse- 

 cund, more or less falcate, strongly serrate at the point; capsule cylindrical, 

 erect-cernuous; operculum large, rostellate from a tumid base. — Smaller than 

 the last; occurs only in mountainous districts, where it is very common. (Eu.) 



50. IS. curv8tV»IaBina, Hcdw. Dioecious; in general aspect like No. 47 

 and 48, but larger, and not so pinnately ramulose ; readily recognized by its 

 large, cernuous, and, when dry, sulcate capsule ; and by the conspicuous whit- 

 ish, plicate, perichsetial leaves. — Grows with No. 4S. 



51. H. IlaldaBBSHBiUBBl, Grev. Monoecious; stems creeping, irregu- 

 larly branched ; branches subcompreBsed ; leaves ovate-lanceolate and broadly 

 oblong-lanceolate, entire, spreading, more or less seeund ; capsule elongated, 

 cylindrical, nearly erect, slightly incurved ; operculum acutely conic or subros- 

 tellate. — Grows in same places as the last. (Eu.) 



52. II. BieiBBOB-OSSBBBB, Koch. Monoecious ; stems creeping, elongated, 

 with several main divisions, which are closely -subpinnately and fasciculately 

 ramulose ; branchlets subcompressed ; leaves ovate-lanceolate, with a long and 

 narrow strongly serrate and subflexuous point, patent, more or less sccund ; 

 capsule oblong, erect-incurved; operculum short-conic. — Decayed logs, on 

 summits of the Alleghany Mountains. —About the size of No. 48. (Eu.) 



53. IS. prate nse, Koch. Dioecious (in European specimens pscudo- 

 njol. Europ.) ; stems ascending, divided, subfastigiately branched; 



