224 BKYACE^. [Bryutn. 



the outer of long linear or lanceolate teeth, closely articulate 

 below, lamellate inside ; the inner a carinate membrane ascend- 

 ing to the middle of the outer teeth and there divided into seg- 

 ments, which are adherent to the teeth or fi-ee, and separated 

 by two or three generally appendiculate cilia. Annulus gen- 

 erally large, compound, revoluble. 



Subgenus I. CLADODIUM. 



Cilia and sesrments of the internal membrane adhering: to the 

 teeth (Pti/chostomwn), or free and with imperfect or rai*ely per- 

 fect inappendiculate cilia (Cladodium). 



* Flowers bisexual and polygamous. 



1. B. arcticum, Bruch & Schimp. Plants in pulvinate 

 purplish tufts : lower leaves ovate-lanceolate, the upper oblong- 

 ovate, all acuminate, bordered with a brown revolute margin, 

 decurrent at base ; costa excnrrent, slightly denticulate at the 

 apex : capsule pendent, soft, pyriform-clavate, slightly incurved, 

 pale yellow, reddish at the orifice ; lid small, conical, mamillate, 

 yellow ; peristome small ; cilia 2, short : spores large, verrucu- 

 lose, yellowish green; annulus large, revoluble. — Bryol. Eur. 

 t. 335. Pohlia arctica, R. Brown, App. Parry's Voy. Suppl. 

 296 ; Schwaegr. Suppl. iii., t. 272"- 



Hab. Melville Island (Parrij); summit of the Rocky Mountains, 

 British America (Drummond, Bourgeau)] foot of Mount Dana, Cali- 

 fornia {Bolander). 



2. B. purpurascens, Bruch & Schimp. Resembles the 



preceding, differing in its wide tufts, longer stems, reddish 



leaves with narrower scarcely revolute borders, and mucronate 



or cuspidate by the percurrent smooth costa, the narrower 



capsule more regular, constricted under the orifice when dry, 



the larger lid and smaller smooth spores. — Bryol. Eur. t. 336. 



Pohlia purpurascens, R. BroAvn. 1. c. 297. P. arctica, var. 



purpicrascens, Schwaegr. Suppl. iii., t. 272*'- 



Hab. Melville Island (Pamj)\ Rocky Monntains {Bourgeau, accord- 

 ing to Mitten) and Rainy Lake, British America {Iluhhard). 



3. B. Brownii, Bruch & Schimp. Plants densely cespitose 

 and tonientose, green above : leaves narrowly ovate-lanceolate, 

 reflexed on the very narrowly margined borders, slightly den- 



