MUSCI. (MOSSES.) 67 
Trine XXXV. HYPNEZ. 
80. HYPNUM, Dill. (Tab. 19.) 
Calyptra dimidiate, small, fugacious. Operculum between hemispherical- 
adiculate ard conic-rostrate. Capsule ovate or cylindrical, more or less une- 
qual, uspally arcuate-cernuous. Peristome double ; the exterior 16 linear-lan- 
the inner hee by ope cross-bars ; the interior 16 carinate proce 
cilia, arising from a plicate membrane, with 1- zt rellid lz between os pair. 
nflorescence moneecious, dicecious, or polygamous.— A genus, as generally 
received, ae a wey: abi number of species, which, ae in habit 
d y for the most part be combined i 
groups, many of them icidiy of generic value. (‘Yvoy, an ancient cand 
name for some sort of Moss.) 
sa THUIDIUM, Bryol. Europ. — Stems profusely villous, prostrate or ascend- 
1 -3-pinnate ; branchlets mostly short, slender, crowded : stem-leaves 
ovate, long-acuminate ; those of the iimaklon much smaller, ovate, and ovate-lance- 
olate ; all papillose ; areolation dot-like, granulated, opaque ; costa subcontinuous, 
translucent : capsule CRE or cylindrical, more or less cernuous: operculum 
hemispherical-apiculate or conic-rostrate. 
. H. tamariscinum, Hedw. Diccious ; stems prostrate ; ramification 
closely 3-pinnate ; stem-leaves with reflexed and crenulate-denticulate margins ; 
rate. — On the ground and old logs.— A large and very com- 
2. H. delicatulum, L. Diccious; very much like the preceding, 
but its ramification n only 2-pinnate ; rae conic, acuminate, not rostrate ; 
peric 1 leaves not fringed. —On the ground, in dry places. — Mountains of 
Pennsylvania: rare. (Eu.) 
3. H. mintitulum, Hedw. Monecious; 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. pygmum, Bryol. Europ. (Muse. Bor.-Amer. No. 275.) Much 
smaller than the last ; ramification 2-pinnate ; leaves more suddenly acuminated ; 
cheetial leaves elongated, with a more lax reticulation. — Shaded ravines, on 
limestone mk Central Ohio ; growing with H. minutissimum.— Among the 
smallest of th 
a 4. . Moneecious; intermediate in size between No. 
2 and 3; ramification pinnate ; easily recognized by its pla iy nearly regu- 
lar, and crect capsule, with a conical, shortly rostrate operculum. — Hilly dis- 
tricts, on the base of trees, wstcaate eee 
6. Hi. gracile, Br. & Sch. Monecious ; size and ramification as in the 
last ; capsule oblong, i -d 3 operculum convex-conic, apiculate. — 
