Jennings: Manual of Mosses — 14. Bryaceae 121 



with central strand, radiculose at leas: at base; leaves in several series, below 

 mostly small and remote, above larger and often tufted, often bordered: costa 

 mostly with 2-5 median guides, often excurrent; cells never papillose, upp:r 

 prosenchymatous, mostly rhomboidal or rhombic-hexagonal, rarely linear or 

 vermicular, basal rectangular to quadrate: seta elongate, erect, smooth, more 

 or less curved; capsule cernuous to pendulous, sometimes erect, mostly sym- 

 m.etric, rarely arcuate, neither striate nor plicate, ovate or pyriform, rarely 

 almost globose; collum evident, usually wrinkling when dry; annulus usually 

 present, large-celled, spirally deciduous; peristome rarely none, or simple, 

 mostly double, the 16 teeth often bordered, hygroscopic, papillose on the 

 exterior, C!>pecially towards the apex, divisural line evident, trabeculae promi- 

 nent; segments alternating with teeth, delicate, yellowish or hyaline, often 

 with cilia, often united below into a basal membrane; spores small to medium; 

 operculum conic to convex, umbonate to apiculate or rarely short-rostrate; 

 calyptra cucullate, small, fugacious. 



A large and cosmopolitan familv of about 15 genera and possibly 1,000 



species. 



Key to the Genera 



A. Leaf-cells narrow, upwards narrowly rhombic to linear B 



A. Leaf-cells lax, upwards rhombic to hexagonal, never linear C 



B. Leaves long-subulate; cilia prommently appendiculate L Leptobryum 



B. Leaves linear-lanceolate; cilia non-appendiculate, often rudimentary or none 



2. Pohlia 



C. Annulus mostly none; leaves decurrent, non-bordered; costa ending below apex 



3. Mmobryum 



C. Annulus usually present; leaves often bordered; costa usually percurrent or slightly 



excurrent D 



D. Sporogonia single; stem without rhizome-like stolons 4. Bryum 



D. Sporogonia often several together; stems erect from rhizome-like stolons 



5. Rhodobryum 



1. Leptobryum (Schimper) Wilson 



Synoicous or dioicous; paraohyses of the antheridial inflorescence with an 

 acuminate end-cell; no paraphyses in the archegonial inflorescence: weak, cespi- 

 tose in low, soft, lax, yellowish-green tufts; stem erect, thin, brown-radiculose 

 at base; lower leaves remote, small, lanceolate, uppermost leaves much larger, 

 tufted, erect to spreading, elongate-subulate from a lanceolate base, canalicu- 

 late and often distinctly toothed towards the apex; costa broad, flat, incom- 

 plete or percurrently filling the apex; cells very narrow and long, in the 

 subulation linear, the basal rectangular-elongate: seta short to long, very 

 thin, tortuous, twisted when dry; capsule cernuous to almost pendent, with a 

 thin, long, somewhat arcuate, pyriform collum, lustrous, narrow-mouthed; 

 annulus narrow, deciduous; peristome-teeth pale yellow, the upper part subu- 

 late and bordered; segments about as long, fenestrate, the lower third forming 

 a basal membrane, the cilia mostly long-appendiculate; spores of medium size; 

 operculum small, convex, and mostly umbonate. 



A genus of four species; one in Tasmania, two in South America, and th? 

 following, almost a cosmopolitan: 



