MUSCI. (mosses.) 641 



3. A. ('liSpuin, T. P. James. More robust than richer of the foregoing ; 

 steins simple, lower leaves small, somewhat spatulate ; the upper much larger, 

 oblong-lanceolate, inclining to spatulate, slightly undulate, with a thickened den- 

 tate border, the costa percurrent, scarcely lamellate ; areola? rather large, hexag- 

 onal-rotund ; capsule obovate-oblong, erect-cernuous, its mouth ample ; teeth of 

 the peristome very short, somewhat irregular; pedicel stout, red : dioecious. — 

 Banks of small streams, New Jersey, James. — A very distinct species. 



44. POfiOIATCM, Beauv. Hair-cap Moss. (Tab. 17.) 



Calyptra cuculliform, very hairy ; the hairs forming a dense mat, covering the 

 whole capsule. Operculum rostellate from a convex base. Inflorescence dioe- 

 cious : male flower cup-shaped. — Mode of growth as in Atrichum ; leaves more 

 rigid, spreading frorn a sheathing base, lanceolate, the costa below narrow, above 

 very broad and covered with numerous crowded lamellae. — (Name from Tt<x>y<x>v, 

 a beard; from the hairy calyptra.) 



* Stems extremely short. 



1. P. brevicaille, Brid. Stems 2" -3" high; leaves few, erect-ap- 

 pressed, the lower ovate-acute, the upper narrowly lanceolate from a broad base, 

 erose-denticulate above ; capsule cylindrical, erect; operculum shortly rostellate ; 

 calyptra whitish. — Moist clayey banks, Eastern States and westward. — The 

 ground around is always covered by a green stratum of confervoid filaments. 



2. P. bracliyphylliiiBi, Michx. Much like the last; stems shorter; 

 leaves oval-oblong, obtuse, entire ; capsule oblong, cernuous ; calyptra brownish. 

 — On the ground, road-sides, &c, Southern States. 



* # Steins elongated. (Alpine species.) 



3. P. urnigerum, Brid. Stems divided above ; leaves lanceolate from 

 a short sheathing base, pointed, serrate, the lamella? of the costa abruptly thick- 

 ened on their borders; capsule cylindrical, the surface granulated. — White 

 Mountains, New Hampshire. — Plant 2' - 4' high. (Tab. 17.) (Eu.) 



4. P. capillare, Brid. Very like the preceding, but a smaller plant; 

 leaves oblong, approaching to spatulate, pointed, more loosely placed on the 

 stem ; pedicels more slender ; rostrum of the operculum rather flexuous ; teeth 

 of the peristome more linear, their basal membrane conspicuously emergent. — 

 White Mountains, New Hampshire. 



5. P. alpilium, Brid. Stems much elongated, fastigiately branched 

 above ; leaves linear-lanceolate from a long sheathing base, serrate ; lamelia? of 

 the costa gradually thickened at their margins ; capsule erect or oblique, oval- 

 oblong, the surface smooth. — White Mountains, New Hampshire. — Larger 

 than any of the above. (Eu.) 



45. POLYTRICHIA, Brid. Hair-cap Moss. (Tab. 17.) 



Calyptra and operculum as in the last. Capsule 4 - 6-sided, oblong or ovate, 

 with a discoid apophysis, erect (when dry horizontal), long-pedicellate. Peri- 

 stome single : teeth 64 : — otherwise as in Atrichum ; with the inflorescence and 

 mode of growth of Pogonatum. — Tall showy Mosses, among the largest of the 



54* 



