26 MUSCI. (MOSSES.) 
Trarse VI. TRICHOSTOMEZ. 
19. TRICHOSTOMUM, Br. & Sch. (Tab. 15.) 
Calyptra cuculliform. Operculum conic-rostrate. Capsule oval or cylindr- 
cal, mostly erect, a8 auneemal Peristome single: teeth 32, linear, approxi- 
mate in pairs. rescence various. “—Filants growing on the ground or on 
stones, of a rather rigid habit; stems simple or dichotomously divided ; leaves 
varying from lanceolate to Tiiseubiscate hats, costate to or beyond the apex ; 
areolation loose below, dense and roundish above. (Name from 6pié, a hair, 
and gréua, a mouth, in allusion to the capillary teeth of the peristome.) 
T. tértile, Schrad. Stems mostly simple, 3!’- 5" high; leaves lance- 
olate-subulate, spreading, often subsecund, reflexed on the margin; costa excur- 
rent; capsule cylindrical ; operculum shortly rostrate; annulus simple: dicecious ; 
male flower terminal. — Road-sides, clay-banks: frequent. (Tab. 15.) (Eu.) 
2. T. ténue, Hedw. pean from small forms of the last, which 
it much resembles, mainly by its large double annulus, me and brownish-red 
eapsule, and the plane (not abso, margin of the leaf. — Pennsylvania, accord- 
ing to Hedwig. (Eu. 
3. T. vAaginans, Sulliv. Stems 6-10" high, slender; stem-leaves 
erect, appressed, ovate-lanceolate; the perichetial leaves po Peiins apeadtins 
at the mg and exc cal 
uated, spreadin x, the costa st sule 
oval-oblong ; teeth the peristome short, anastomosing in pairs; annulus 
double, very large, its width equal to half the length of the teeth ; pedicel slen- 
der, flexuous; operculum elongated-conic, obtuse ; ere 
Sides of ditches and roads Pomsian. ai New England. 
4. ee pallidum, Hedw. Stems short, 3! -4!! leaves long-seta- 
ceolate base ; costa broad, excurrent, denticulate at the apex; 
cee oblong-elliptic. — Clayey grounds; frequent. — Conspicuous by 2 nu- 
merous, iy (1}'-2! high) straw-colored pedicels; moncecious; male flower 
gem in the axils of the upper leaves. (Eu.) 
5. . veiusbicoms: Hedw. Stems densely cxspitose, 6-10" high, 
fastigiately branched ; lower leaves small, remote, lanceolate ; the upper larger, 
20. pierces Hedw. (Tab. 15.) 
Cat enculliform. Operculum subulate-conic. Capsule oval-oblon 
rescence various. — In habit, ramification, texture, and mostly in the form of the 
leaves, allied closely to Trichostomum : differing chiefly in the torsion of the 
peristome. (Name a diminutive of barta, beard, in 
allusion te the capillary 
