Ptychomitrium.] BRYACE.E. 157 



2. P. incurvum, Sulliv. Plants dark green or yellowish 

 brown when old : leaves erect, slightly incurved when moist, 

 twisted-crispate when dry, the lower very small, gradually 

 larger toward the top of the stems, linear-lanceolate, more or 

 less obtuse, thick, opaque, plane on the borders ; costa broad, 

 vanishing with or below the apex; perichtetial leaves similar: 

 male buds axillary or cladogenous : calyptra mitriform, cover- 

 ing the capsule to below the middle, split and plicate to the 

 base of its long beak : capsule oval, erect ; teeth 16, long- 

 subulate, distantly articulate, entire, papillose. — Mosses of U. 

 States, 35, and Icon. Muse. 63, t. 39. Weissia incurva, 

 Schwaegr. Suppl. ii. 51, 1. 116. I^. jnisilluni, Bruch & Sclnmp. 

 Lond. Journ. Bot. (1843) ii. 665, not Bryol. Eur. ; Sulliv. Muse. 

 Allegh. n. 135. Grimmia Ilookeri, Drumm. Muse. Amer. 

 n. 61. 



Hab. On exposed rocks, especially sandstone; Eastern New York, 

 and southward to Georgia ; very common in Southern Ohio ; Canada, near 

 Niagara Falls (Driimmond). 



3. P. Drummondii, Sulliv. Larger than the last and 

 more loosely ti^fted, the leaves more open, spreading and re- 

 flexed when moistened, lanceolate, more distinctly acute and 

 denticulate-serrate on the borders : peristome attached far be- 

 low the orifice of the capsule, the teeth shorter, joined in pairs, 

 closely articulate, split at the apex into two or three irregular 

 short segments ; annulus wanting, and spores larger. — Mosses 

 of XJ. States, 36, and Icon. Muse. 65, t. 40. Grimmia Drum- 

 mondii, Hook. & Wils. ; Wils. in Hook. Journ. Bot. (1841) iii. 

 90, t. 3, and iv. 422, t. 25, B. 



Hab. On trees, from Southern Virginia and Tennessee southward. 



4. P. pygmaeuni, Lesq. & James. Plants very small, 

 olive-green : leaves close, spreading when moist, twisted when 

 dry, linear from the more enlarged ovate base, muticous, dark 

 green, smooth ; costa vanishing far below the apex : male 

 flowers axillary in buds at the base of the perichsetium : calyp- 

 tra large, covering the capsule to its base : capsule on a short 

 reddish pedicel, oval, with a collum one-third as long as the 

 sporangium ; teeth nearly equal, linear-subulate, papillose, red- 

 dish, joined in pairs at base, some connate their whole length ; 

 articulations indistinct. — Proc. Am. Acad. xiv. 136. 



Hab. On stones (?) near the Neosho River, Kansas, and at Bolivar, 

 Missouri {E. Hall). 



