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Musci. (mosses.) (CT) 667 



Teibe XXXV. HYPNE^. 

 80. HYPNUM, DiU. (Tab. V.) 



Calyptra dimidiate, small, fugacious. Operculum between hemispherical- 

 apiculate and conic-rostrate. Capsule ovate or cylindrical, more or less une- 

 qual, usually arcuate-cemuous. Peristome double; the exterior 16 linear-lan- 

 ceolate articulate teeth, marked on the back by a medial liae, and cristate on 

 the inner face by projecting cross-bars ; the interior 1 6 carinate processes or 

 cilia, arising from a plicate membrane, with 1-3 ciliolEe between each pair. 

 Inflorescence monoecious, dioecious, or polygamous. — A genus, as generally 

 received, embracing a very large number of species, which, presenting in habit 

 and structure great diversity, may for the most part be combined into natural 

 groups, many of them seemingly of generic value. (Yttvov, an ancient Greek 

 name for some sort of Moss.) 



§ 1. THUIDIUM, Bryol. Europ. — Stems profusely villous, prostrate or ascend- 

 ing, 1 - 3-pinnate ; branchlets mostly short, slender, crowded : stem-leaves broadly 

 ovate, long -acuminate ; those of the branchlets much smaller, ovate, and ovate-lance- 

 olate ; all papillose ; areolation dot-like, granulated, opaque ; costa subcontinuous, 

 translucent : capsule oblong-oval, or cylindrical, more or less cernuous : operculum 

 hemispherical-apiculate or conic-rostrate. 



1. H. tamarlscmam, Hedw. Dioecious ; stems prostrate ; ramification 

 closely 3-pinnate ; stem-leaves with reflexed and crenulate-denticulate margins ; 

 branch-leaves ovate-lanceolate ; perichsetial leaves fringed on the margin ; oper- 

 culiun conic-rostrate. — On the ground and old logs. — A large and very com- 

 mon species. (Eu.) 



2. H. delicdtullim, L. Dioecious ; very much like the preceding, 

 but its ramification only 2-pinnate ; operculum conic, acuminate, not rostrate ; 

 perichffitial leaves not fringed. — On the ground, in dry places. — Mountains of 

 Pennsylvania : rare. (Eu.) 



3. H. mmatillum, Hedw. Monoecious; smaller than the preceding, 

 with a simply pinnate ramification ; capsule horizontal, oval, nearly regular ; 

 operculum large, convex-conic, with a long slender beak. — On decayed logs, in 

 woods; not rare. (Eu.) 



4. H. pyg:ill^Ulll, Bryol. Europ. (Muse. Bor.-Amer. No. 275.) Much 

 smaller than the last ; ramification 2-pinnate ; leaves more suddenly acuminated ; 

 perichsetial leaves elongated, with a more lax reticulation. — Shaded ravines, on 

 limestone rocks. Central Ohio ; growing with H. minutissimum. — Among the 

 smallest of the Hypna. 



5. H. scitum, Beauv. Monoecious ; intermediate in size between No. 

 2 and 3 ; ramification pinnate ; easily recognized by its cylindrical, nearly regu- 

 lar, and erect capsule, with a conical, shortly rostrate operculum. — Hilly dis- 

 tricts, on the base of trees, particularly the Beech. 



6. H. g^acile, Br. & Sch. Monoecious ; size and ramification as in the 

 last ; capsule oblong, incurved-cernuous ; operculum convex-conic, apiculate. — 



