MUSCI. (MOSSES.) 63 
entire, more or less secund; capsule oval or ovate-oblong, its mouth small ; 
pedicels 5-7" high; operculum conic, scarcely rostellate; inner peristome a 
granulated grayish membrane, adherent to and bordering the lower half of each 
tooth, free above, and split into two Reicadeweecusis divergent segments, as in 
Bartramia ; sporules light oie Seg their diameter one balf greater than 
in No. 1.—(Pterigynandrum intri , Hedw.) — Trees and logs ; common, 
(Tab. 18.) 
3. P. velutina, W. P. Sch. Exceedingly like and formerly confounded 
with No. 2; leaves with fewer quadrate alar cells; capsule cylindrical, its mouth 
larger ; ipereulih decidedly rostellate ; teeth of the peristome more closely ar- 
ticulated, narrowly bordered their whole length by the adherent inner peristome ; 
sporules dark yellowish-green, granulated, with a diameter twice as great as in 
the first species. — Bark of trees, Columbus, Ohio. 
(P. potyAnTHA, a common European ange and found in British America 
by Drummond, has the peristome of No. 1 the capsule and short-conice 
operculum of 
73. HOMALOTHECIUM, Bryol. Europ. (partly.) (Tab. 19.) 
Calyptra cuculliform, hairy. Operculum conic, subrostellate. Capsule ovate- 
cylindrical, regular and erect, or oblique and incurved, pedice i annulate. 
Peristome double; the exterior 16 linear- anmeolase mete “A close articula- 
tions conspicuous a on the margins; the interior 16 t 
or a membrane lining the teeth. Inflorescence moncecious or dioscions. — Stems 
prostrate, closely and pinnately branched ; leaves shining, costate, serrulate, 
with an oblong-rhomboidal areolation. — (Name from dpadds, Ss and Onxn, 
a sige applicable to the type of the genus, Leskea sericea, Hedw. 
. H. subcapillatum, Bryol. Europ. Monecious; sh elliptical 
or pena tical, suddenly acuminated, not striate, serrulate ; costa single or 
ashe raighuss: ees: pedicel rough ; capsule inclined, slightly incurved ; 
the p rk-red, with a broad pellucid central stripe marked by 
a pe zigzag medial line; inner peristome a membrane lining the teeth. — 
(Pterigonium ascendens, Schwegr. Suppl. t. 243. Pt. decumbens, Schweegr. I. c. 
t. 110. Pterigynandrum brachycladon, Brid. Bryol. Univ. 2. p. 185.) — A smail 
species resembling Pylaisza intricata, and growing with it on trees: common. 
(Tab. V.) 
74. PLATYGYRIUM, Bryol. Europ. (Tab. 19.) 
Calyptra cuculliform, aca = — Operculum conic, short-ros- 
trate. Capsule oval-oblong, erect, pedicellate. Peristome double; the exterior 
broadly margin interior 16 filiform cilia, the 
basilar membrane obsolete. Annulus very large. Inflorescence dicecious. — 
Rather small. species, with prostrate closely entangled subpinnate stems; and 
oblong-lanceolate ecostate leaves, with a linear areolation. — (Name compostll 
of mAarus, large, and yvpos, ring, referring to the annulus.) 
1. P. répems, Bryol. Europ. Branches short, rather julaceous, ascend- 
G. M. 5 
