640 MUSCI. (MOSSES.) 



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

 ly reticulated. (Named after /. C. Buxbaum, an early German botanist.) 



1. B. apliylln, 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. DIPHirSCIUM, 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 ; antheridia numerous, paraphysated. Small bulb-like 

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

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

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

 the point, the costa excurrcnt into a long serrulate awn. (Name from Si's, 

 twice, and <^>u07eioz/, a vesicle ; the wide separation of the thecal and sporangial 

 membranes giving the appearance of one vesicle within another.) 



1. D. foil OS II ill, Web. & Mohr. Whole plant 3"-4" high. Clayey or 

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



TRIBE XVIII. POLYTRlCHE^. 

 43. ATRICHUM, 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 6pif~, rpt^o's, a hair, 

 in allusion to the naked calyptra.) 



1. A. undnlatum, Beauv. Stems erect, mostly simple; leaves long 

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

 with 2-4 narrow lamella?. (Cathcrinea 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. aiigUSti\tM!ll, Beauv. More slender than the preceding; leaves 

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

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

 swamps: common. Dioecious : male flower terminal. (Tab. 17.) Eu.) 



