Hypnum.] BRYACE^. 333 



areolation scarcely marked by a few oval cells, the large capsule, the inner 

 peristome without cilia, etc. The leaves are more regularly and deeply 

 plicate than in any other species of the subgenus. 



31. H. pinnatifldum, Sulliv. & Lesq. Plants soft, widely 

 and loosely cespitose, bright or pale green ; stems slender, pros- 

 trate, brittle, densely pinnately raniulose, rootless ; branchlets 

 short and flexuous, or longer and flagelliform : leaves open-erect, 

 densely imbricate, lanceolate, gradually subulate-acuminate, pli- 

 cate, revolute or reflexed on the borders, slightly denticulate at 

 the apex ; costa thick, ascending to above the middle ; cells of 

 the areolation linear-rhoraboidal, tlie alar quadrate and minute ; 

 perichajtial leaves imbricate at the sheathing oblong base, grad- 

 ually long-acuminate, ecostate : capsule thick, oblong or obo- 

 vate, incurved on a short flexuous rough pedicel ; operculum 

 large, highly conical, constricted in the middle, maraillate ; 

 peristome normal ; annulus large. — Muse. Bor.-Araer. Exsicc. 

 (ed. 2), n. 513 ; Lesq. Mem. Calif. Acad. i. 33 ; Sulliv. Icon. 

 Muse. Suppl. 101, t. 77. 



Hab. Shaded rocks in canons, California {Bolander), 



32. H. arenarium, Lesq. Widely and loosely cespitose, 

 dirty yellow, irregularly branching ; stems slender; branchlets 

 short and erect, or longer and filiform, attenuated, radiculose : 

 leaves erect, imbricate, lanceolate-acuminate, striate, serrulate, 

 reflexed on the margins ; costa stout, vanishing below the apex; 

 cells of the areolation narrow, small, numerous, scarcely dis- 

 tinct, the basilar round-ovate, covering the whole base of the 

 leaves ; outer perichsetial leaves broadly ovate, short, with a re- 

 flexed point, the upper sheathing, abruptly narrowed into a fili- 

 form serrulate erect or reflexed point, coarsely dentate below it : 

 capsule small, cylindrical-ovate, cernuous ; pedicel long and 

 slender, rough toward the base, nearly smooth above ; oper- 

 culum large, obtusely conical, apiculate ; segments perforated ; 

 cilia one or two, short ; annulus compound, large, persistent. — 

 Trans. Amer. Phil. Soc. xiii. 13. 



Hab. Covering sand around bushes near San Francisco, California 

 (Bolandej-). 



Easily distinguished from the following by its slender form, the short 

 curved capsule, etc. 



33. H. nitens, Schreb. Densely cespitose, bright or dirty 

 green, glossy ; stems erect, radiculose at the base of the leaves : 

 leaves erect-spreading, strict, long-lanceolate, subulate-acumi- 



