316 BRYACE^. [Orthothecium. 



3. O. chryseum, Bruch & Schimp. Tufts golden glossy- 

 yellow ; stems erect, simple or 2-3-parted : leaves strict, lanceo- 

 late and ovate-lanceolate, apiculate, concave, deeply plicate : 

 capsule subcernuous, ovate-oblong ; lid convex, aj^iculate ; inner 

 membrane very large, ascending to the middle of the teeth; 

 segments carinate, entire ; cilia irregular and nodose. -. ^^ Bryol. 

 Eur. t. 461. Ilypnum cJtryseo)i, Schwaegr. ; Mue^l. Syn. ii. 

 385. H. rufescetis, Drumm. Muse. Amer. n. 221. Stereodon 

 chri/seus, Mitten, 1. c. 39. 



Hab. Moist rocks among the Rocky Mountains of British America 

 {Brumriond, Bourgeau), and Arctic America. 



Tribe XXIII. HYPNE^. 



Plants very variable in size, appearance, ramification, etc., 

 densely or loosely cespitose. Leaves either turned in all direc- 

 tions, open or squarrose, or complanate, or secund, or falcate- 

 secund, of multiple forms, round to narrowly lanceolate, costate 

 or ecostate, subscai'ious, generally soft and glossy; areolation 

 parenchymatous, the meshes narrowly rhomboidal, linear or 

 vermicular, quadrate and often enlarged at the basal angles. 

 Flowers monoecious or dioecious, very rarely bisexual. Capsule 

 solid, long-pedicellate, cernuous or horizontal, more or less 

 incurved, not pendent, and very rarely erect and regular. 

 Peristome double, perfect, the outer of 16 strong densely 

 articulate lanceolate-acuminate teeth, the inner a broad mem- 

 brane divided to the middle or about into 16 carinate yellow 

 segments, which are more distantly articulate, entire, or cleft 

 alone the keel between the articulations or even their whole 

 length, and generally separated by 1 to 3 articulate or appen- 

 diculate cilia. 



128. HYPNUM, Dill. 



A single polymorphous genus, divided into numerous sections, 

 or subgenera, most of which have been considered by some 

 authors as genera. 



