640 (40) Musci. (mosses.) 



like, broad-ovate, deeply cut and long-ciliated on the margins, not costate, loose- 

 ly reticulated. (Named after J. C. j^uxbaum, an early German botanist.) 



1. B. apbylla, Haller. Stem and leaves having the appearance of a 

 minute hauy bulb, many times smaller than the capsule with its short cylindri- 

 cal apophysis ; pedicel rather stout, 7"-10" high, tuberculate. — New England 

 and New York; rare. (Tab. HI.) (Eu.) 



42. DIPHYSCIUM, Weber & Mohr. (Tab. m.) 



Calypti-a small, conic, entire at the base, scarcely covering the elongated-conic 

 operculum. Capsule large, ovate, oblique, gibbous, subsessile, immersed. Peri- 

 stome double (?) ; the exterior a very naiTow slightly dentate ring, quite rudi- 

 mentary ; the interior as in Buxbaumia. Inflorescence dioecious : male flower 

 terminal, gemmiform ; antheridia numerous, paraphysated. — Small bulb-like 

 mosses, annual or biennial, the sessile capsule forming the principal part ; stem 

 very short, its leaves lingulate, spreading, entire, costate, thick and fleshy ; the 

 perichffitial leaves much larger, membranous, erect, lanceolate, ciliate-lacerate at 

 the point, the costa excurrent into a long seiTulate awn. (Name from St's, 

 twice, and (jivaKiov, a vesicle ; the wide separation of the thecal and sporangial 

 membranes giving the appearance of one vesicle within another. ) 



1 . D. foliosum, Web. & Mohr. Whole plant 3 " - 4" high. — Clayey or 

 barren soil ; not unfrequent in hilly districts. (Tab. HI.) (Eu.) 



Tkibe XVni. POLYTEICHE^, 

 43. ATRICHUM, Beauv. (Tab. HI.) 



Calyptra narrowly cucuUiform, naked, spinulose at the apex. Operculum 

 hemispherical at the base, with a long slender rostram. Capsule cylindrical or 

 oblong, nearly erect, shghtly arcuate, long-pedicellate. Peristome single : teeth 

 32, short, ligulate, obtuse, incun^ed and adhering by then- summits to the margin 

 of the disk-like apex of the columella. Inflorescence monoecious or dioecious : 

 male flower cup-shaped. — Intermediate in habit between Polytrichum and 

 Mnium ; the flowering stems erect, simple or branched, from a creeping rhizoma ; 

 leaves small below, much larger and elongated above, crisped when diy, of a 

 minute firm hexagonal areolation, the percurrent costa beai-ing on its upper sur- 

 face 2 or 3 narrow lameUse. — (Name from a privative, and 6pl^, rpixos, a hair, 

 in allusion to the naked calyptra.) 



1. A. nndllla-tum, Beauv. Stems erect, mostly simple; leaves long 

 ligulate-lanceolate, undulate, spinulose-toothed, narrowly margined, the costa 

 with 2-4 narrow lamellae. (Catherinea undulata, BncZ.) — Moist clay-banks, 

 in hilly districts ; rare. — Monoecious : fertile flower tenninal on a prolongation 

 of the axis of the sterile flowers. (Eu.) 



2. A. angfnstatum, Beauv. More slender than the preceding ; leaves 

 narrower, more densely reticulated, not denticulate below the middle, the costa 

 with more numerous and broader lamellas. — Shady woods, and margins of 

 swamps; common. — Dioecious : male flower terminal. (Tab. III.) (Eu.) 



