36 



BKYACE^. 



Ijeaves densely crowded, glossy, not costate. 

 Calyptra dimidiate, long, twisted. Seg- 

 ments of tlie peristome narrowly linear, as 

 long as the teeth; cilia none. 



Leaves spreading or subsecund, not costate, 

 glossy. Teeth of tlie peristome hyaline- 

 bordered; segments linear-subulate, longer 

 than tlie teetli; cilia rudimentary. 



Leaves long, thinly costate. Calyptra hairy. 

 Capsule soft, regular. Membrane narrow; 

 segments shorter than the teeth, with or 

 without cilia. 



Plants large, more or less compressed. Leaves 

 costate, entire. Capsule cylindrical, long- 

 pedicellate. Teeth distantly articulate; seg- 

 ments very narrowly linear; cilia none. 



Plants lai'ge, dendroid. Leaves in two forms, 

 squamiform on the stems. Calyptra long, 

 dimidiate, clasping the top of the pedicel. 

 Capsule oblong-cylindrical, long and long- 

 pedicellate, yegments as long as the teeth, 

 cleft to the base; cilia none. 



Plants yellow. Leaves sulcate, not costate. 

 Capsule erect or slightly incurved. Teeth 

 of the peristome hyaline-bordered ; segments 

 as long, linear; cilia short or none. 



122. Platygyrium. 



123. Pylaisia. 



124. Homalothecmm. 



125. Cylindrothecium. 



126. Climacmm. 



127. Orthothecium. 



Tribe XXIIL HYPNE^. Plants of very variable habit. Leaves of 

 diverse forms, spreading or squarrose, rarely erect, often secund or 

 falcate, with or without costa or bicostate at base, generally scarious, 

 smooth and glossy; areolation parenchymatous, more or less nar- 

 rowed, sometimes very narrow and vermicular, quadrate and en- 

 larged at the basal angles. Vaginule attached to a perichajtial 

 generally rooting branchlet. Calyptra cucullate. Capsule long- 

 pedicellate, cernuous or horizontal, more or less incurved. Peri- 

 stome double, generally perfect, with 2 or 3 cilia appendiculate or 

 articulate. — A single genus, represented in this work by nearly 200 

 species, divided into 28 subgenera, which are considered as genera 

 by most recent bryologists. 128. Hypnum. 



Series I. ACROCARPI. 



Fruit terminal, becoming lateral only when thrown aside by 

 innovations from under the flowers. 



A. CLETSTOCARPI. — Capsule falling off with the pedicel 

 or from it at maturity, dehiscing irregularly transversely in the 

 middle for the emission of the spores. 



Tribe I. PHASCE^. 

 Plants very small, soft. Leaves loosely areolate. Capsule 

 globular, immersed, subsessile or short-pedicellate. 



