632 (32) Musci. (mosses.) 



costate, plane on the margins ; areolte above guttulate ; below, enlarged oblong. 

 (Name from C'^yos, a pair, and oSwv, teeth, in allusion to the paired teeth.) 



1. Z. liapponicus, Br. & Sch. Stems J' -1' high, radiculose ; leaves 

 spreading, crisped when dry; capsule scarcely exserted, 8-ribbed; peristome 

 none : monoecious ; male flower gemmiform. — Eocks, on the White Mountains 

 of New Hampshire, Oakes ; Alleghany Mountains of Pennsylvania, Lesquereux. 

 (Tab. n.) (Eu.) 



2. Z. Moilg'eotii, Br. & Sch. More elongated and branched than No. 

 1 ; differing chiefly in its narrower and less concave perichsetial leaves twice as 

 long, the longer rostrum to the operculum, and the dicecious inflorescence. — 

 With No. 1, in similar places, according to Mr. Th. P. James. (Eu.) 



3. Z. SulliV£iiitii, Mull. Stems l'-2' high, slender, with long fihform 

 branches ; leaves subsquaiTose from an erect half-clasping base, complicate-con- 

 cave ; the margins below recurved, above plane and strongly sen-ate ; fruit 

 unknown. — (SyiThopodon escelsus, Sulliv. Muse. Alleglian., No. 170.) — North 

 Carolina; on rocks, top of Grandfather Mountain, Chray ^ Sullivant: Black 

 Mountain, Lesquereux. 



31. ©RUMMONDIA, Hook. (Tab. H.) 



Calyptra large, cuculliform, rostrate, slightly plicate at the base, and papillose 

 at the apex. Operculum obliquely long-rostrate from a convex base. Capsule 

 globose-oval or slightly obovate, exsertly pedicellate. Peristome single : teeth 

 16, veiy short, truncate. Inflorescence dicecious: male flower gemmiform. — 

 Perennial, growing on trees ; stems prostrate, throwing up numerous short 

 branches, bearing fruit on their summit ; leaves oblong, costate ; areolte minute, 

 roundish. — (Named after the late Thomas Drummond, who made extensive and 

 very valuable collections of North American Mosses. ) 



1 . ©. clavellata; Hook. Stems 2' - 4' long, creeping, densely covered 

 with radicels; branches crowded, erect, 2" -3" high; leaves close, erect-patent, 

 shortly acuminate ; costa ceasing with the apex. — Grows in deep-green and close 

 thin mats (3' -10' in diameter), on the bark of trees (particularly the Beech), 

 Northern, Mddle, and Western States. (Tab. H.) 



Tribe XHI. OKTHOTEICHE^. 



32. ORTHOTRICHUM, Hedw. (Tab. H.) 



Calyptra large, campanulate, longitudinally plaited, crenate-lacerate at the 

 base, hairy or glabrous. Operculum short, conic, rosteUate. Capsule pyriform, 

 more or less elongated, apophysate, pedicellate, immersed or exserted, 8 or 16 

 striated, ribbed when dry. Peristome single or double, rarely wanting; the 

 outer 16 teeth, with a medial line, mostly in pairs (often reflexed when dry) ; 

 the inner 8 or 16 cilia. Inflorescence monoecious or dioecious : male flower 

 gemmiform. — Perennial plants, growing in roundish cushion-like tufts, on trees 

 or rocks, never on soil ; stems usually erect, simple or branched by innovations, 

 fertile at their summit ; leaves crowded, elongated, costate nearly to the point, 



