Best : North American Pseudoleskea 227 



late on upper, not rarely smooth on both, oval -rhombic to linear- 

 oblong, .006-.008 mm. wide, 2 to 3 times as long : basal cells 

 quadrate-oblong to sublinear ; alar transversely oval, becoming 

 roundish quadrate and extending well up the margins ; apical small, 

 oval to oval-oblong : branch leaves falcate, more distinctly ser- 

 rulate, scarcely plicate. Dioicous : perichetial bracts erect, whitish, 

 long and narrowly subfiliform acuminate, distantly toothed or 

 entire, lightly costate : cells long linear, subvermicular : pedicels 

 9- 1 1 mm. long, more or less curved: capsule oval-oblong, sub- 

 symmetric, cernuous, reddish brown : exothecial cells roundish 

 oblong-quadrate ; exostomial teeth reddish brown, confluent at 

 base into a reddish band 5 joints wide : lamellae numerous, stout : 



endostomial band yellowish, scarcely papillose, about W the 



length of the teeth ; segments as long but narrower than the teeth, 

 open on the keel : cilia one to two, more or less developed ; annu- 

 his narrow, indistinct : operculum conic : spores rough, .014-.016 

 mm.; matures in spring. 



Type locality Vancouver Island ; duplicate of type in Coll. 

 Can. Geol. Surv.; collected by Prof. John Macoun, June 8, 1887. 



On rocks and stones apparently at high altitudes. British Co- 

 lumbia (Macoun), Washington (Roll), Montana (Williams), Idaho 

 (Leiberg), Colorado (Brandegee). 



Exsic. : Macoun, Can. Muse. 610. 



P. oligoclada differs from P. atrovirens in its leaves being 

 much longer acuminate (acumen longer than body), its polymor- 

 phous leaf cells, smooth or lightly papillate on upper surface ; from 

 P. radicosa in being more rigid, leaf cells smaller and capsule more 

 symmetric. Forms occur with the margins of the leaves less 

 strongly recurved, costa thinner and shorter and median cells some- 

 what longer ; it appears to take on these characters in its advance 

 eastward and southward. 



3. Pseudoleskea pallida sp. nov. [PL 6] 



In dense appressed tufts, pale olive green above, rusty brown 

 below. Primary stems defoliate, secondary prostrate-ascending, 

 2-4 cm. long, often matted together below, sparingly branched 

 above ; branches straight or curved at tips, but slightly diverging : 

 paraphyllia few, small : stem leaves asymmetric, deeply concave, 

 biplicate, lightly costate to near apex, straight or subsecund, .7— .9 

 mm. long, .4— .5 mm. wide ; from a roundish ovate base gradually 

 acute to abruptly short-acuminate, acumen somewhat blunt pointed 

 and serrate or narrow and semi-twisted : cells of stem leaves 



