659 
mitsci. (mosses.) 
rather flexuous; teeth of peristome more linear, with their basal mem- 
brane coasp.cuoasly emergent. - White Mountains, New Hampshire. 
4. P. alpinuin, Brid. Stems much elongated, fastigiatclv 
branched above ; leaves linear-lanceolate from a long sheathing base, ser¬ 
rate ; lamella of the nerve gradually thickened at their margins; cap. 
sule erect or oblique, oval-oblong , the surface smooth.— White Moun¬ 
tains. — Larger than any of the above. 
30. POLVTBICHW, L. Ha,e-Cap Moss. 
Calyptra densely hairy. Capsule 4 -6-sided, with a discoidal 
apophysis. Peristome single, of C4 teeth, adherent by their sum- 
mils to the membranous-dilated apex of the columella.' Otherwise 
as in the last. (Name formed of rro\i s , many, and 6pi£, hair; 
the calyptra apparently made up of hairs.) 
1. P commune, Linn. Stems nearly erect, simple; leaves 
spreading or recurved, linear-lanceolate , flat, serrate on the margins 
and back; the lamells somewhat 2-cleft at their margins; capsule 
oblong 4-stded, the angles acute ; lid short-beaked from a convex base. 
— Shady, moist places. —Plant 6'-12 high. 
2. P. formosuni, Hedw. Differs from the preceding by its 
longer and slightly curved capsule with obtuse angles , smaller obconic 
apophysis tapering into the pedicel, and the conical lid. — Woods, 
around the base of trees, &c. 
3. P. gracile, Menzies. Usually somewhat smaller than No. 1 
or 2; capsule ovate, 4 - 6-sided, obtuse-angled ; lid long-beaked ; woolly 
hairs of the calyptra shorter than the capsule; spores large; basal 
membrane of the peristome not emergent. — Boggy places, Ipswich, 
Massachusetts, Oakes. 
4 - P. juniperimim, Hedw. Stem simple or divided ; leaves 
linear-lanceolate, awn-pointed , the margins infiexed , entire ; capsule and 
lid as in No. 1. — Var. strictum ; stems elongated, slender ; leaves 
appressed ; capsule cubical. — Margins of woods, exposed places, 
&c. Plant 4' - 7 f high ; the variety subalpine. 
5- P. pifliferum, Schreb. Stems simple; leaves clustered at 
its summit, lanceolate , the margins inflexed, entire, the nerve cxcurrent 
into a long diaphanous awn ; capsule ovate-oblong, 4-sided ; lid coni¬ 
cal, beaked. — Rocky places, mountainous districts; plant 2'-4' high. 
Buxbaumiace^. 
31. BlTXBAtlMIA, Haller. Buxbaumia. 
Calyptra minute, cylindrical-bell-shaped. Capsule terminal, 
ovate, gibbous, plane on the upper side, convex on the lower, 
