234 Best : North American Pseudoleskea 



apical linear ; median sublinear .006 mm. wide, 4-6 times as long. 

 [Dioicous : perichetial bracts whitish, erect, inner sub-sheathing, 

 finely acuminate, entire or serrulate above, lightly costate : pedi- 

 eels 7—9 mm. long, straight or nearly so : capsules erect, sym- 

 metric, oval-oblong to subcylindric : urn 1.2 mm. long, .6 mm. 

 wide : exothecial cells thick-walled, quadrate-oblong : exostomial 

 teeth yellowish, linear-lanceolate, confluent at base into a reddish 

 band 3 joints wide, scarcely lamellate : endostomial band about | 

 the length of the teeth ; segments narrowly linear, somewhat 

 shorter than the teeth : cilia none : annul us narrow, indistinct : 

 operculum long conic : spores rough, .013-.016 mm.: from Euro- 

 pean specimens.] 



Type locality, British Columbia ; type in Coll. of Geol. Surv. 

 of Canada ; collected by Prof. John Macoun on rocks below 

 Hector, Rocky Mts., Aug. 13, 1890. R. S. Williams, rocks on 

 shores of Lake Lindeman, Northwest Territory, May 21, 1898. 

 Sterile. 



The basal cells which are oblong-linear in 2 to 3 rows, ab- 

 ruptly passing to the median, readily distinguished Lescuraca from 

 the other two subgenera in which the basal cells are quadrate or 

 oblong-quadrate in several rows passing somewhat gradually to 

 the median. 



Plants referable to this subgenus are evidently rare in North 

 America. In Europe they are not uncommon, on the higher 

 mountains, often in fruit. Limpricht* recognizes two species, Z. 

 striata (Schwaegr.) Br. & Sch. and L. saxicola (Br. & Sch.) Mo- 

 lendo, which represent the extremes of a series of intergrading 

 forms. Between these are a number of intermediate forms some 

 of which are sufficiently distinct to be recognized as species. P. 

 snbstriata is one of these and differs from L. striata in being 

 smaller and in having its smaller leaves shorter acuminate and the 

 acumen more or less sharply serrate. In L. striata the leaves are 

 usually entire, long and slenderly acuminate, 1.8 mm. long, .5 

 mm. wide. 



Excluded or doubtful Species 



Pseudoleskea atricha Kindb. Eur. & N. A. Bry. 53. 1897. 

 Pseudoleskea atrovireus var. atricha Kindb. Cat. Can. Plants, 

 6 : 180. 1892. 



*Die Laubmoose, 2 : 789. 1 895. 



