MUSCI. (MOSSES.) 41 
3. A. crispum, T.P. James. More robust than either of the foregoing ; 
stems simple, lower leaves small, somewhat spatulate; the upper much larger, 
oblung-lanceolate, inclining to spatulate, slightly undulate, with a thickened den- 
er, the costa percurrent, scarcely lamellate ; areolw rather large, hexag- 
the peristome very short, somewhat irregular; pedicel stout, red: dicecious. — 
Banks of small streams, New Jersey, James. — A very distinct species. 
44. POGONATUM, Beauv. Harr-car Moss. (Tab. 17.) 
Calyptra cuculliform, very hairy ; the hairs forming a dense mat, covering the 
whole capsule. Operculum rostellate from a convex base. Inflorescence dicw- 
cious: male flower cup-shaped. — Mode of growth as in Atrichum; leaves more 
rigid, spreading from a sheathing base, lanceolate, the costa below narrow, above 
very broad and covered with numerous crowded lamellx.— (Name from mayer, 
a beard ; from the hairy calyptra 
%* Stems extremely short 
. P. brevicatile, Brid. Stems 2-3" hi gh; leaves few, erect-ap- 
oe ed, the lower ovate-acute, the upper narrowly lanceolate from a broad base, 
erose-denticulate above ; capsule cylindrical, erect ; operculum shortly rostellate ; 
calyptra whitish. ic Midian clayey banks, Eastern States and westward. — The 
ground around is always covered by a green stratum of confervoid filaments. 
2. P. peti shcatheraions — Much like the last; stems shorter; 
leaves oval-oblong, obtuse blong, cernuous ; calyptra brownie, 
— On the ground, vobi-aiien, ped noethien eases: 
* Stems elongated. (Alpine species.) 
. P. urnige vain Brid. Stems divided above; leaves lanceolate from 
a short sheathing base, pointed, serrate, the lamelle of the costa abruptly thick- 
ened on their borders; capsule RPL the surface granulated. — White 
Mountains, New Hampshire. — Plant 2'-4! high. (Tab. 17.) (Eu. 
apillare, Brid. Va? like the preceding, but a smaller plant; 
iesvel ss approaching to spatulate, pointed, more loosely placed on the 
stem ; pedicels more slender; rostrum of the operculum rather flexuous; teeth 
of the peristome more linear, their basal membrane conspicuously emergent. — 
White Macias New Hampshire. 
5. P. alpinum, Brid. Stems much elongated, Priests: branched 
above ; leaves linear-lanceolate from a long sheathing base, serrate; lameliz of 
the costa gradually thickened at their margins; aus erect or oblique, oval- 
portin the surface smooth.— White Mountains, New Hampshire.— Larger 
than any of the above. (Eu.) 
45. POLYTRICHUM, Brid.  Harr-car Moss. (Tab. 17.) 
Calyptra and operculum as in the last. Capsule 4-6-sided, oblong or ovate, 
with a discoid nat erect (when dry horizontal), ap -pedicellate. Peri- 
stome single: te +— otherwise as in um; with the inflorescence and 
e of growth rn os showy Mosses, among the largest of the 
