678 (78) MUSCI. (MOSSES.) 
72. H. minutissimum, Sulliy. & Lesqx. (Muse. Bor.-Amer. No. 343 é) 
Moneecious ; — - ores irregularly branched ; leaves ecostate, subentire, 
those of the y lanceolate from a broadly ovate base, widely spread- 
ing ; branch-leaves heath. abate, linear-lanceolate, subappressed ; capsule obo- 
vate, inclined, cernuous; operculum large, hemis erical-conic, apiculate ; an. 
n 
d irregularly serrate. (Muse, Alleghan. No. 31.) — Grows bie H. pygme- 
um, in close, thin, deep-green strata, on limestone rocks; in vines, 
Penn. and sage — The smallest of our Hypna. oe por to H. confer- 
voides, Schwegr., and H. Sprucei, Bruch: the first is twice as large, and has a 
pinnate raked: an oblong capsule, and entire jatidiniilh leaves : the second 
is dicecious, with ciliate-dentate perichxtial leaves; but in all other respects 
(even in the capsule, which is seepage described as erect and regular) it 
approaches very near to this species 
73. H. adnatum, Hedw. Moncecious; leaves closely imbricated, ovate 
and ovate-lanceolate, seiitaiy acuminated, concave, shortly bicostate, the mar- 
gins nearly entire and reflexed below; capsule oblong, erect-cernuous ; perich- 
tial leaves irregularly denticulate.— A small species, growing in thin, close 
mats, on stones near the surface of the ground ; seldom on t 
74. A. w oncecious; stems sparingly ge closely 
ranches simple, filiform, unequal, flexuous-erect ; lea ding, 
ovate-lanceolate, acuminate, entire or obsoletely serrulate, costate ah if- 
way ; areolation rather large and pellucid ; capsule elongated-cylindrical, cernu- 
ous-incurved, broadly annulate.— On rocks, decayed logs, and the d. 
Subject to many varieties. (Eu.) 
75. Hi. radicale, Brid. (Bryol. Europ.) Moneecious; closely related 
to the preceding, but larger and more rigid ; leaves entire, lon mger and more 
suddenly acuminated from a broader and rounder ase, with a stouter costa 
extending to the apex ; areolation closer. (H. ees pu authors.) — Same 
localities as the last ; likewise very variable. — (In Bryol. Europ. a new species, 
Amblystegium serratum, near my is indicated, with at strongly serrated 
leaves and a shorter costa: founded on specimens from Reading, Penn.) (Eu.) 
76. H. orthécladon, ‘ane Moneecious ; larger than H. radicale, 
i d 
cid, entire, shorter-acuminate from a broad cordate 
base ; costa continuous ; areolation smaller. — Wet springy places. 
77. Hi. noteré6philum, Sulliy. & Lesqx. (Muse. Bor. -Amer. No. 34 
Moneecious ; divisions of the stem with an irregular pinnate ramification ; seins 
of the fertile stems broadly ovate-lanceolate, shortly acuminate, erect-spre ading, 
with a strong excurrent costa; those of the thick and firm immersed sterile 
stems erect, appressed, narrowly linear-lanceolate, graduall tapering from an 
ovate base, long-cuspidate by the heavy costa, which occupies nearly 4 of the 
lamina ; capsule elongated-cylindrical, erect-incurved, n narrowly annulate. (H. 
fluviatile, James, in Proceed. Acad. Nat. Sci. Phil. 1855. ) — Abounds in lime- 
stone springs, Franklin County, Penn., Prof. Porter.— A stout, Pay dark- 
green Moss, resembling Amblystegium irriguum, var. fallax, Br ryol. Europ 
. 
