C40 MUSCI. (mosses.) 



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

 ly reticulated. (Named after J. C. Bux'oaum, an early German botanist.) 



1. B. ajulsj'lBa, Haller. Stem and leaves having the appearance of a 

 minute hairy 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. 17.) (Eu.) 



42. DIPHtSCIVM, Weber & Mohr. (Tab. 17.) 



Calyptra 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 narrow slightly dentate ring, quite rudi- 

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

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

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

 very short, its leaves Ungulate, spreading, entire, eostate, thick and fleshy ; the 

 perichaetial leaves much larger, membranous, erect, lanceolate, ciliate-laeerate at 

 the point, the costa excurrent into a long serrulate awn. (Name from Sir, 

 twice, and (pvo-nlov, a vesicle ; the wide separation of the thecal and sporangial 

 membranes giving the appearance of one vesicle within another.) 



1. J>. folioSMBii, Web. & Mohr. Whole plant 3" -4" high. — Clayey or 

 ban-en soil ; not unfrequent in hilly districts. (Tab. 17.) (Eu.) 



Tribe XVIII. POLYTRICHEiE. 

 43. ATBICHIJM, Beauv. (Tab. 17.) 



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

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

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

 32, short, ligulate, obtuse, incurved and adhering by their 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 dry, of a 

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

 face 2 or 3 narrow lamellae. — (Name from a privative, and 6pL£, rptxoy, a hair, 

 in allusion to the naked calyptra.) 



1. A. uildllli&tuin, Beauv. Stems erect, mostly simple; leaves long 

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

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

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

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



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

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

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

 ewarnps; common. — Dioecious: male flower terminal. 'Tab. 1*7.) Eu.) 



