674 (74) Musci. (mosses.) 



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

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

 ceolate, mm-e or less long-acuminate, usually suhsecund or fiilcate-secund, obsoletely 

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

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



46. H. molliiscuui, Hedw. Dioecious ; grows in soft mats ; stems 

 procumbent cr ascending, diciiotomously divided ; the divisions very closely 

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

 points ; leaves suddenly lanceolate-attemlate from a broad base, falcate-secund, 

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

 woods ; mostly in mountainous regions. (Eu.) 



47. H. cupressifornie, L. Dioecious ; stems creeping, in-egularly or 

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

 nilate at the point, falcate-secund ; capsule oblong or cyKndiical, erect-cemu- 

 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. — Veiy variable. (Eu.) 



48. !!• imponeos, Hedw. Dioecious ; stems prostrate, extended, di- 

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

 minate, falcate-secund, shai-ply serrate at the point, the margins below reflexed ; 

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

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

 of our most common species. (Eu.) 



49. H. reptile, Michx. Monoecious ; stems slender, creeping, elongated, 

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

 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. H. curvif oliuiU) Hedw. Dioecious ; in general aspect like No. 47 

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

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

 ish, plicate, perichastial leaves. — Grows with No. 48. 



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

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

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

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

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



52. H. nemordsum, 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 subfiexuous point, patent, more or less secund; 

 capsule oblong, erect-incun'cd ; operculum short-conic. — Decayed logs, on 

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



53. H. prat6nse, Koch. Dioecious (in Em-opean specimens pseudo- 

 monoecious, Biyol. Europ.) ; stems ascending, divided, subfastigiately branched; 



