MUSCI. (MOSSES.) 641 



0k 



3. A. crispum, T. P. James. More robust than either of the foregoing ; 

 stems 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 ; areolae rather large, hexag- 

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

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

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



44. POGONATUM, 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 from a sheathing base, lanceolate, the costa below narrow, above 

 very broad and covered with numerous crowded lamellae. (Name from ir<aya>v, 

 a beard; from the hairy calyptra.) 



* Stems extremely short. 



1. P. brevicaole, 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. brachyphyllum, 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. 



* * Stems elongated. (Alpine species.) 



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

 a short sheathing base, pointed, serrate, the lamellae 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 peristorae more linear, their basal membrane conspicuously emergent. 

 White Mountains, New Hampshire. 



5. P. al|>imim, Brid. Stems much elongated, fastigiately branched 

 above ; leaves linear-lanceolate from a long sheathing base, sen-ate ; lamella 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. POLYTRICHUJfl, 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* ' 



