628 (28) , MUSCI. (MOSSES.) 
21. DESMATODON, Brid. (Tab. IL) 
Calyptra cuculliform. Operculum conic, obtusely rostrate. Capsule oval- 
oblong or cylindrical, annulate, long-pedicellate. Peristome Siete; teeth 16, 
subulate, 2-3-cleft, united by a basilar membrane. Inflorescence moncecious 
or dicecious. — Plants of rather low stature, growing on the ground or on rocks, 
in general habit, ci and structure of leaves having much in common 
with Trichostomum and Barbula. — (Name from décopa, -aros, a band, and ddav, 
a tooth, in allusion to the saan uniting the teeth.) 
renaceus, Sulliv. & Lesqx. (Musc. Bor.-Amer., N 
Pp phn 
tapering into the pedicel a 5M long); annulus simple, persistent ; teeth of the 
peristome 2-cleft, straight, white. — Sandstone rocks, Ohio. — Near D. flavicans. 
- D. plinthdébius, Sulliv. & Lesqx. (Muse. Bor. eed No. 94.) 
Stems 2”—5! high, fastigiately branched ; leaves erect, elon , very 
obtuse, carinate-concave, narrowly fellexed on the margins ; ateotntibie ihiviate, 
opaque, d ott e above, larger oblong and pellucid below; costa excurrent into 
a 
its mouth orange-red ; operculum $ the length of apsule; teeth of the peri- 
stome pale yellow, more or less cloven along the medial line; annulus large 
iceci (Barbula m » James ; not of Hedw.) — Grows in hoary or pale- 
on the walls of the College at Nashville, Tenness see, Lesquereux 
22. DIDYMODON, Br.&Sch. (Tab. IL.) 
Calyptra cuculliform. Operculum conic, shortly and prom rostrate. Cap- 
sule subcylindrical, annulate, long-pedicellate. Peristo e single; teeth 16, 
linear-Janceolate, entire, or more or less bifid, rather mae: snssla cious, and with- 
oO rane. Inflorescence various. — Very nearly allied to the last 
genus ; and it is SORT if either is entitled to rank higher than as a section 
of Trichosto (Name from didvpos, twin, and ddév, a tooth.) (Tab. II.) 
1. D. ‘aia, Br. & Sch. Stems }/~1’ high, loosely cxespitose ; leaves 
epianinng oblong-lanceolate, recurved on the margins, costate to the a = 
ones dull-green, the lower reddish; annulus simple ; antheridia naked 
the axils of the perichztial leaves.— Pennsylvania, on the oes; rare. 
(Tab. IL.) (Enu.) 
2. D. litridus, Hornsch. Rather smaller than the last; leaves lurid- 
green, rigid, ovate-lanceolate, with a reddish-brown costa, ceasing at the apex; 
peristome minute, irregular ; male flower terminal on a separate plant. — Falls 
of Niagara, Drummond. (En.) 
Tre VII. DISTICHIER. 
23. DISTICHIUM, Br.& Sch. (Tab. IL) 
Calyptra cuculliform, long-rostrate. Operculum conic, short. Capsule oval- 
