636 (36) Musci. (mosses.) 



tui-e, composed of minute and somewhat quadrate cellules ; capsule rotund-oval, 

 its mouth small ; teeth of the peristome often divided to the base ; annulus large, 

 unrolling. — (Muse. Alleghan., No. 135.) — On rocks, Pennsylvania and south- 

 ward. (Tab. II.) 



2. P. Driimmdndii, Hook. & Wils. Somewhat larger than the pre- 

 ceding ; leaves linear-lanceolate, acute, crisped when dry ; teeth of the peri- 

 stome more or less perforated, inserted below the mouth of the oblong-oval 

 capsule ; annulus none. — On trees. Southern States. 



Tkibe XV. GRIMMIE^, 



36. SCHISTIDIUM, Br. & Sch. (Tab. II.) 



Calyptra small, not extending to the mouth of the capsule, conic-mitiiform and 

 lacerate at the base, or cuculliform and entire at the base. Opei'culum depressed- 

 convex, papillate or shortly rostellate, deciduous with the columella attached. 

 Capsule roundish-oval, oval-oblong, or obovate, wide-mouthed, immersed, with a 

 short erect pedicel. Peristome single : teeth 16, lanceolate, cribrose. Inflores- 

 cence monoecious : male flower gemmiform. — Growing in circular more or less 

 compact tufts, on rocks (chiefly mountainous) ; stems simple, or dichotomously 

 branched and fastigiate ; leaves of a rigid and rather brittle texture, crowded, 

 spreading, ovate-lanceolate, acuminate, concave below, channelled above, usually 

 reflexed on the margins, continuously costate, mostly tipped with a pellucid hair- 

 point ; areolae minute and nearly quadrate, those at the base larger, oblong and 

 diaphanous. — (Name from (tx^C^j to split, the base of the calyptra being la- 

 ciniated.) 



1. S. apocarpum, Br. & Sch. Loosely csespitose ; stems |-'-l' long, 

 upper leaves usually with white points ; capsule elliptical, firm ; teeth of peri- 

 stome sometimes entire, purplish-red ; annulus none ; calyptra 5-lobed at the 

 base. — On rocks, very common. — Foliage blackish-green : subject to numerous 

 foiTus, dependent on locality. (Tab. 11.) (Eu.) 



2. S. maritimuiBl, Br. & Sch. More robust than the last, densely 

 tufted ; leaves longer, narrower, more rigid, never hair-pointed, the margins 

 plane, the costa stouter and shortly exeurrent ; capsule obovate, truncate ; spo- 

 rules twice as large ; calyptra the same. — On rocks near the sea, Eastport, 

 Maine, J. L. Russell. (Eu.) 



3. S. confei'tum, Br. & Sch. Eesembles No. 1 exceedingly; tufts more 

 compact ; leaves less lurid, their mai-gins not so recurved ; capsule oval or 

 roundish, of a thinner texture, paler-colored, almost pellucid ; teeth of the peri- 

 stome more cribrose and lacerated, and of an orange color ; calyptra the same. — 

 New England, OaJces. — A variety with obtuse leaves occurs on the "White 

 Mountains. (Eu.) 



4. S. ambig^uum, Sulliv. Near the preceding, but has larger and 

 elliptic-lanceolate perichsetial leaves, with a long, flexuous, dentate, pellucid 

 hair-point; capsule oval-oblong; calyptra cucullifonn. — {Mem. Amer. Acad, 

 Art, and Sci. n. ser. 4, p. 170.) — Dry rocks, Santa F6, N. Mexico, Fendler. 



