MUSCI. (MOSSES.) 33 
spreading, entire, usnally revolute on the margins, of a minute dot-like 1 
tion, except at the marginal base, the areole there being lagi, te rectangular, and 
— (Name from i Bh and 6pi£, rpixés, a hair, in allusion to the 
traight hairs on the calyptra 
6 1. Capsule immersed or a exserted. a asa in No. 5 and 6). 
* Peristome single: cilia wa 
5 va i Hoffm. Stems ne wae: - ha leaves lanceolate, 
keeled p with 16 striz ; teeth of the peristome nearly equidis- 
tant; ‘sil sparsely balsy's ; male nine terminal. — On rocks, Niagara Falls, 
Drummond: Lake Superior, Agassiz. (Eu. 
2. @. Stiarmii, Hoppe & Hornsch. Very like the last species ; but its im- 
mersed and obovate capsule is indistinctly 8-striated ; the male flower axillary. — 
Texas, Wright. (Eu.) 
3. nai oer cine Hedw. Separated from the preceding (to which it 
ly) mainly by its exserted and distinctly S-striated ¢ capsule. — 
Wicks; near ‘Daten, Mass., Lesquereux: Lake Superior, Agassiz. (Eu.) 
xanrum, Sulliv. Larger than No. 2, which it Re but 
its immersed capsule is oblong-pyriform and distinctly 8-striated ; teeth of the 
_ peristome in pairs ; calyptra very hairy ; leaves longer, narrower, and more re- 
curved-spreading. — Texas, Wright: Santa Fé, New Mexico, Fendler. 
* * Peristome double. 
0. obtusifolium, Schrad. Stems 6-10" ea leaves when moist 
erect-patent, not recurved, ligulate from an oblong base, obtuse, concave, some- 
what convolute on ae — anid papillose, a costa vanishing much 
below the point; cap oblong-pyriform, the long apophysis gradu 
pis me into the very short pedicet 5 cilia of the peristome 8, composed of 
of cellules half as wide as the teeth; calyptra glabrous. — Trees, Cam- 
ne ilcincidaie Lesquereux. (Eu.) 
6. O. exiguum, Sulliv. Nearly related to No. 5, but much smaller; 
stems 3-5! high; leaves more acute, scarcely papillose: costa stouter, extend- 
ing to the point; the arcolee at the base not so enlarged; capsule oval; the — 
apophysis rather short; pedicel longer ; cilia of the peristome 8, carinate, com- 
_ posed of two rows of Sitio fully as 88 as the teeth; operculum convex, 
apiculate. — Base of trees, Santee Canal, South Carolina, Ravenel. — The small- 
est of our Orthotricha. — This and the related species have, scattered on the 
surface of their leaves, a few articulated excrescences (Conferva Orthotrichi). 
7. O Régeri, Brid. Leaves ——— when moist narrowly 
ligulate from a ventricose concave base, canali , plane on the margins 
above, revolute below, somewhat acute a a os apex; capsule and calyptra as in 
No. 5; cilia 8, simple, filiform. — Trees, Lake Superior, Agassiz. (Eu.) 
8. O. strangulatum, Beauv. Stems short, compact; leaves broadly 
- ovate-lanceolate, carinate, somewhat obtuse, the margins strongly reflexed ; cap- 
sule — somewhat beh immersed, very much constricted below 
mouth when dry; cilia of the peristome as in the last; calyptra hairy. — On 
trees; ie common. 
