MUSCI. (MOSSES.) (67) 667 
Trisr XXXV. HYPNES. 
SO. HYPNUM, Dil. (Tab. V.) 
tra dimidiate, small, fugacious. Operculum re igi hemispherical- 
apiculate and conic-rostrate. Capsule ovate or cylindrical, more or less une- 
qual, usually arcuate-cernuous. Peristom e double ; the eae 16 linear-lan- 
fi 3 
orescence monecious, dicecious, or polygamous.—A genus, as generally 
received, embracing a very large number of species, which, presenting in habit 
cture great diversity, may for the most part be combined into natural 
groups, many of them seemingly of generic value. (‘Ymvoy, an ancient Greek 
name for some sort of Moss 
§1. THU{DIUM, Bryol. Europ. cea etd ee l gees Ga 
i I branchlets 
ovate, long 
lista all papillose ; areolation dot-like, granulated, opaque ; costa subcontinuous, 
: capsule oblong-oval, or cylindrical, more or ieee cernuous: opercul 
or conic-rostrate. 
1. H. tamariscinum, Hedw. Dicecious ; stems prostrate ; ramification 
closely 3-pinnate ; stem-leaves with reflexed and crenulate-denticulate margins ; 
branch-leaves ovate-lanceolate ; perichetial leaves fringed on the margin ; oper- 
conic-rostrate. On the ground and old lo ogs. — A large and very com- 
i Eu.) 
2. H. delicdatulum, L.  Diccious; very much like the preceding, 
but its ramification only 2-pinnate ; opercubdin conic, acuminate, not rostrate ; 
pericheetial leaves not fringed. —On the ground, in dry places. — Mountains of 
Pennsylvania: rare. (Eu.) 
: lum, Hedw. Moncecious; 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. ai 
4. H. pygm@z#uma, Bryol. Europ. (Muse. Bor.-Amer. No. 275.) Much 
smaller than the last ; Casein 2-pinnate ; leaves more suddenly acuminated ; 
pericheetial leaves longaid, with a more lax reticulation. — Shaded ravines, on 
limestone rocks, Central Ohio; growing with H. minutissimum.— Among the 
smallest of the Hypna. 
5. Hi. scitumm, Beauv. Monecious; 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, pra of trees, particularly the Beech. 
gracile, Br. & Sch. Moneecious; size and ramification as in the 
a a oblong, incurved-cernuous ; operculum convex-conic, apiculate. — 
