G8 MUSCI. (MOSSES.) 
72. Hi. minutissimum, Sulliv. & Lesqx. (Muse. Bor.-Amer. No. 343.) 
Moncecious ; stems capillary, irregularly branched ; leaves ecostate, subentire, 
of the stem narrowly lanceolate from a broadly ovate base, widely spread- 
ing; branch-leaves much smaller, linear-lanceolate, subappressed ; capsule obo- 
vate, inclined, cernuous; operculum la: he ee apiculate ; an- 
nulus simple, narrow; inner peristome ciliolate ; perichstial leaves sted 
and irregularly serrate. (Musc. Alleghan. with H. pygm 
um, in close, thin, deep-green strata, on See rocks; in shaded ravines, 
Penn. and Ohio. — The smallest of our Hypna. Closely allied to H. confer- 
bivatone exon de and H. Pilabers, “Hybond ae first i is Mo as large, and has a 
an 1 leaves; the second 
is is disecious) with cilinte-denitate ares we jeaves ; but in all other. respects 
(even in the capsule, which is pana described as erect and regular) it 
approaches very near to this spe 
3. datum, Hedw. Monecious; leaves closely imbricated, ovate 
and ied lacsecien; suddenly acuminated, mages shortly bicostate, the mar- 
gins nearly entire and reflexed below; capsule oblong, erect-cernuous ; perichs- 
tial leaves irregularly denticulate.— A small species, aisha in thin, close 
mats, on stones near the surface of the ground ; seldom o 
74, H. sérpens, Hedw. Monecious; stems s pee divided, closely 
flex 
75. H. radicale, Brid. (Bryol. Europ.) Monecious; closely related 
to the preceding, but larger and more rigid; leaves entire, longer and more 
localities as the last ; likewise very variable. — (In Bryol. Europ. a new species, 
Amblystegium serratum, near this, is indicated, with smaller strungly serrated 
leaves and a shorter costa: founded on specimens from Reading, Penn.) (Eu.) 
76. Hi. orthécladon, Beauv. Monecious; larger than H. radicale, 
with longer, ge oe: succulent, upright and straight branches ivney its spe- 
cific name) ; es flaccid, entire, shorter-acuminate from 
base ; costa eeoue. areolation smaller. — Wet springy shia 
77. H. not vihugasere mes — & est (inse,, Bor. nes: ee merit 
erect-incurved, narrow 
fluviatile, James, in Proceed. Acad. Nat. Sci. Phil. 1855.) —Abounds in lime 
stone springs, Franklin County, Penn., Prof. Porter. —A stout, rigid, dark- 
green Moss, resembling Amblystegium irriguum, var. fallax, Bryol. Europ. fase 
