MUSCI. (MOSSES.) (83) 633 
spreading, entire, usually ae on the margins, of a minute dot-like areola- 
at page at the marginal base, the areole there being larger, rectangular, and 
(Name from ae straight, and Opi£, rptxés, a hair, in allusion to the 
at hiss on the calyptra. 
§ 1. Capsule immersed or slightly exserted. Monecious (except in No. 5 and 6). 
* Peristome single: cilia wanting. 
1, 0. a“ Hoffm. Stem Paley 1’! high; leaves lanceolate, 
keeled ; with 16 striz ; ath of the peristome nearly a tuk 
tant ; calypink sparsely hairy ; male flower terminal. — On rocks, Niagara 
Drummond: Lake Superior, Agassiz. (Eu.) 
2. at Letoerr ese aye & Horned. Very like the last species ; but its im- 
8-striated ; the male flower axillary. — 
aries ave (Eu.) 
3. O. anémalum, Hedw. Separated from the preceding (to which it 
spac wn mainly by its exserted and distinctly 8-striated capsule. — 
Rocks, near Salem, Mass., Lesquereur: Lake Superior, Agassiz. (Eu.) 
4. O Pn niall Sullivy. Larger than No. 2, which it resembles, but 
its dente capsule is oblong-pyriform and distinctly 8-striated ; teeth of the 
peristome in pairs; calyptra ve oe leaves longer, narrower, and more re- 
curved-spreading. — Texas, a se anta Fé, New Mexico, Fendler. 
* Peristome double. 
obtusifolinm, Hehe. Stems 6-10" high; leaves when moist 
en: not recurved, ligulate from an oblong base, obtuse, concave, some- 
i uch 
below the point; capsule immersed, oblong-pyriform, the long apophysis gradu- 
ally tapering into the very short pedicel; cilia of the peristome 8, composed of 
two rows of cellules half as wide as the teeth; calyptra glabrous. — Trees, Cam- 
bridge, Massachusetts, (Eu. 
» Sulliv. Nearly re’ related to No. 5, but much smaller; 
ing to the point; the areole at the base not so enlarged; capsule oval; the 
es, rather short ; pedicel se i cilia of the peristome 8, carinate, com- 
of ws of cellules fully as broad as the teeth; chorea convex, 
aii aan of trees, Santee Game Bou Carolina , Ravenel. e small- 
est of our Orthotricha. — This and the related species leet scattered on the 
surface of their leaves, a few articulated excrescences (Conferva Orthotrichi). 
7. O. Régeri, Brid. Leaves spreading-recurved, when moist narrowly 
ligulate from a ventricose concave base, canaliculate, plane on the margins 
above, revolute are: somewhat acute at the apex; capsule and calyptra as in 
No. 5; cilia 8, simple, filiform. — Trees, Lake Superior, Agassiz. (Eu.) 
inate, some 0 , the xed; cap- 
ule oblong, somewhat pyri i , very much constricted 
mouth : of the peristome as in the last; calyptra hairy.— On 
