H7jpnum.] BKYACE^. 3I9 



* * * * Plants very large. Leaves turgid, rugulose. 



2G. Scorpidium. Stems irregularly divided. Leaves large, lanceo- 

 late-acuminate or broadly oblong and acute or obtuse; areolation 

 very close and narrow; basal cells numerous, quadrate. Capsule 

 cylindrical, arched, 



D. Plants large ; divisions arcuate, ascending or proliferous ; paraphyllia 



numerous. 



27. Pleurozium. Stem arcuate, prostrate and proliferous; branches 



bi-tripinnate. Leaves membranous, shining, shortly bicostate or 

 semicostate; areolation linear, narrow, uniform. Capsule round- 

 ovate. 



28. Hylocomium. Stems with few branches, pinnately fastigiate- 



ranuilose. Leaves squarrose or reflexed, shortly bicostate; areo- 

 lation linear, narrow, somewhat enlarged at base. Capsule short, 

 turgid, horizontal. 



Subgenus I. PSEUDOLESKEA. (PI. 6.) 



Mode of growth and arrangement of the leaves and para- 

 phyllia as in Leskea. CajDSule cernuous or horizontal, short, 

 turgid, thick-walled. Teeth of the peristome solid ; membrane 

 large; segments as long as the teeth, regular, carinate, cleft 

 between the articulations, generally separated by more or less 

 perfect cilia. — PseudolesJcea, Bruch & Schimp. 



1. H. atrovirens, Dicks. Densely cespitose, dark green ; 

 stem much divided and subpinnately ramulose ; branchlets 

 flexuous : leaves minutely papillose, open or subsecund, lanceo- 

 late from an ovate base, concave, entire, the borders recurved ; 

 costa stout, vanishing below the apex ; paraphyllia numerous 

 and multiform : capsule cernuous or horizontal, oval or oblong, 

 more or less turgid, dark brown, constricted under the orifice 

 when dry and empty ; pedicel smooth, curved above ; operculum 

 convex-conical, acute or apiculate ; cilia none ; annulus very 

 narrow, simple. — Crypt. Fasc. ii. 10 ; Smith, Engl. Bot. t. 2422. 

 H. filamentosum^ Dicks. 1. c. Pseudoleskea atrovireiis, Bruch 

 & Schimp. Bryol. Eur. t. 477. 



Hab. On rocks; Niagara Falls and Lake Superior (Macoiin); Lake 

 Huron (Mrs. Roy); very rare, and sterile. 



2. H. catenulatum, Brid. Mode of growth as in the last ; 

 leaves very small, spreading when moist, closely imbricate when 

 dry, lanceolate from an ovate base ; borders recurved from the 

 middle downward ; costa flat, vanishing in the middle ; cells 

 small, oval, uniformly oblique at base; paraphyllia filiform, 



