232 Best : North American Pseudoleskea 



In the Sullivant collection are two interesting specimens both of 

 which were sent to Sullivant by Schimper. One of these is 

 Hypnum radicosum from Mitten, the other Leskca rigescens from 

 Wilson. These are to be regarded as duplicates of the types and 

 are of value in that they serve to fix the meaning of these species. 



6. Pseudoleskea rigescens (Wils.) Lindb. Act. Soc. Fenn. 10 : 



277. 1872. [PI. 7] 



Lcskea rigescens Wils. Ms. Drumm. Muse. Am. 225 in part. 

 Lescuraea rigescens Bryol. Eur. 5: 185 1. 



Hypnum radicosum, var. gracile Lesq. & James, N. A. Mosses. 



320. 1884. 



Pseudoleskea stenophylla Ren. & Card. Bot. Centralbl. 44: 421. 



1 890. 



Lescuraea imperfecta C. M. & K. Cat. Can. Plants , 6 : 170. 

 1892. 



Lescuraea stcnopliylla Kindb. Eur. & N. A. Bry. 26: 1897. 



In soft, somewhat silky intricate tufts or mats, pale yellow- 

 green. Stems prostrate, 2-4 cm. long, radiculose, irregularly 

 branched : branches unequal, curved, attenuate : paraphyllia small, 

 linear-lanceolate : stem leaves subcrispate and loose when dry, 

 erect-spreading when moist, straight or subsecund, lanceolate to 

 ovate-lanceolate, gradually long and narrowly acuminate, entire or 

 serrulate above, lightly biplicate, thinly costate, margins plain or 

 revolute below, .8-1.2 mm. long, .25-35 mm. wide : cells of stem 

 leaves smooth or lightly papillose on upper surface, rarely on 

 both : basal cells quadrate oblong in several rows : alar-quadrate, 

 extending well up the margins ; median sublinear-rhomboidal 

 .007—008 mm. wide, 2-4 times as long ; apical oval to oval-oblong 

 or sublinear ; branch leaves narrower, serrulate above. Dioicous : 

 perichetial bracts long lanceolate, narrowly acuminate, thin, erect, 

 whitish, inner sub-sheathing, scarcely costate : pedicels erect or 

 slightly curved above, 6-8 mm. long : capsule small, oval-oblong, 

 usually erect, subsymmetric, lightly contracted when dry : urn 1 

 mm. long, 7 mm. wide : exothecial cells thick-walled, quadrate : 

 exostomiai teeth yellow-red, confluent at base into a dark red band 

 3 joints wide : endostomial band pale yellow, one sixth the length 

 of the teeth or less ; segments narrowly linear, as long as the teeth, 

 concave, joints stout, 6-8 : cilia none ; annulus indistinct or none : 

 spores nearly smooth, .014—018 mm. ; ripe in spring. 



Type locality, North America. 



