Hi/pnum.] BRYACE^. 389 



Subgenus XXI. CTENIUM. 



Plants large, in dense loose rigid tufts ; stems erect or procum- 

 bent, strict, compressed, simple or dichotomous, closely and reg- 

 ularly pinnate-ramulose ; branches frondifoi-m ; branclilets close. 

 Leaves falcate-secund, sulcate. Flowers dicecious. Capsule 

 long-pedicellate, arcuate, cylindrical-oblong. Operculum broadly 

 conical, a})iculate. 



146; H. crista-castrensis, Linn. Tufts yellowish green ; 

 stems simple or forking by innovations, rigid, long; branclilets 

 horizontally divergent, recurved at the apex : stem-leaves broad 

 and incumbent at base, gradually long lanceolate-acuminate, 

 twisted, falcate, deeply sulcate, thin, with a short double costa 

 or nonp, sharply serrate from the middle upward ; paraphyllia 

 numerous, long, narrowly lanceolate ; branch-leaves closer, 

 narrower, falcate-secund, less distinctly serrate, ecostate; peri- 

 cha^tium long-sheathing, whitish ; perichtetial leaves deeply 

 sulcate, ecostate, greenish brown when ripe, dirty yellow when 

 empty : teeth orange below, pale, serrate and subulate above ; 

 cilia three or four, thick, as long as the cleft segments; annulus 

 simple, narrow. — Spec. PI. 1125; Bryol. Eur. t. 599. /Stere- 

 odoii crista-castrensis, Mitt. 1. c. Ptiliiim crista-castrensis, 

 DeNot. Briol. Ttal. 101. 



JIab. Pine woods, on the ground and old prostrate logs; in mountain 

 regions. 



Subgenus XXII. CTENIDIUM. 



Plants Avith few or no radicles ; branches closely pinnately 

 ramulose. Leaves circinnate-secund. Flowers dioecious. Cap- 

 sule subhorizontal, short-pedicellate, thick, solid, turgid-o\ate. 

 Operculum large, convex, conical-apiculate. — Ctenidiicm, Mitt. 



117. H. molluscum, Hedw. In wide tumescent or fastig- 

 iate soft bright or yellowish green tufts ; stems procumbent or 

 ascending, generally eradiculose : leaves crowded, circinnate- 

 falcate downward, flexuous Avhen dry, abruptly narrowly lan- 

 ceolate-acuminate from a broadly obcordate decurrent base, 

 sharply serrate all around ; areolation very dense, narrow, 

 minutely round-quadrate at the angles; paraphyllia ovate- 

 lanceolate; perichaetium short, 5-leaved, the inner oblong, 



