Best : North American Pseudoleskea 233 



On bases of trees or shrubs, more commonly on Alnus, and on 

 rotten wood and rocks, in damp places at high altitudes. Mon- 

 tana (Williams), Idaho (Leiberg), Washington (Roll), British Co- 

 lumbia (Macoun). 



Exsic : Macoun, Can. Muse. 580. 



P. rigescens is somewhat variable. The stem leaves range 

 from being entire to serrate on the acumen, smooth to lightly 

 papillose on both surfaces, costa thin, disappearing above the 

 middle, to rather stout, sometimes toothed and subpercurrent. 

 These differences are not rarely noted in a single specimen. 



From P. radicosa it differs in its narrower, and longer acumi- 

 nate leaves (acumen longer than body), longer vaginule and 

 perichetial bracts, and in its small, suberect capsule with linear 

 segments. The gametophyte characters of depauperate forms of 

 P. radicosa are so near the stouter forms of P. rigescens that it 

 is sometimes almost impossible to make a satisfactory determina- 

 tion without the sporophyte. 



6a. Pseudoleskea rigescens Howei var. nov. 



Intricate, appressed, pale green silky tufts : stems and branches 

 strongly recurved : stem leaves secund to falcate-secund, serrate 

 at apex, .7— .9 mm. long, .2 5-. 3 5 mm. wide ; margins narrowly re- 

 curved : costa stout, disappearing in the acumen : areolation com- 

 pact ; basal and alar cells numerous, quadrate, filling one third of 

 the body of the leaf: capsules not seen. 



Collected by Dr. M. A. Howe, Mt. Shasta, Calif., Aug. 5, 1894. 



§ Lescuraea Sch. : Plants soft, leaves usually smooth, median 

 leaf cells long and narrow, extending downward to nearly the line 

 of insertion, capsule symmetric, segments linear, cilia none. 



7. Pseudoleskea substriata sp. nov. [PI. 7] 



In appressed subshining tufts, yellowish green to golden- 

 brown : stems prostrate, radiculose, 2-4 cm. long, pinnately 

 branched : branches suberect, simple, scarcely curved : paraphyllia 

 few, multiform : stem leaves erect-spreading, straight, deeply bipli- 

 cate, oval-oblong, gradually acute or acuminate (acumen shorter 

 than body), .8-1 mm. long, .3-4 mm. wide: margins strongly 

 recurved to nearly apex, serrate above : costa toothed, subpercur- 

 rent : stem leaves smooth, clear ; basal oblong-linear in 2 or 3 

 rows : alar quadrate, rugose, thick-walled, filling the space be- 

 tween folds and margins, extending upwards and becoming oblong : 



