290 FRYE 



Leaves distant, squarrose, more or less crisped when dry, linear- 

 lanceolate from a hyaline sheath-like base whose edges bear each 

 3 — 5 long hairs, not transversely undulate, not toothed at back; 

 lamina 2 cells thick. Margin not bordered, densely and sharply ser- 

 rate. Lamellae 5 — 8, notwavy from side to side, on upper side only, 

 6 — 8 cells high, toothed. Vein strong, percurrent. Cells round- 

 hexagonal, thick-walled, .008 mm. ; sheath-cells elongated-rectangu- 

 lar, thin-walled. 



Calyptra cucuUate, naked, covering only the lid. 



Capsule erect, symmetric, terete, wide mouthed, smooth, with 

 large 2-celled stomates. Peristome wanting. Lid conic, with long 

 beak. Pedicels single, 8— 12 mm. long, reddish, flexuose when dry. 



Number of species in western North America, i ; total number spe- 

 cies, I. 



1. Bartramiopsis lescurii (James) Kindb., in Rev. Bryol. 1894, 



P- 35- 

 Atrichum lescurii James, in Bull. Torr. Bot. Club. 6: 33 (1879). 



Bartramiopsis sitkana Kindb.," in Rev. Bryol., 1894, p. 35. 



Named after Lesquereux^" 



Plants laxly caespitose. Stems filiform, flexuous, laxly foliose, 

 long naked below. 



Leaves 4 mm. long, subvaginate at base, acuminate, 2 cells thick 

 except near the margin where they are i cell thick, when dry very 

 much crisped, when moist arcuate-spreading. Margin plane, at 

 sheath-like base entire, with 3 — 5 hairs at edge where sheath joins 

 blade, further up the hairs shorten into strong teeth. Vein broad, 

 smooth at base. Cells 01 sheath hyahne, width to length about as 

 1:4 — 6. 



Calyptra glabrous, shortly acuminate. 



Capsule at first slightly ovate-cylindrical, turbinate when old, lid 

 long conic, long acuminate, almost equaling the capsule. Spores 



' Proc. Wash. Acad. Sci. 4; 326 (1902). 



'"Leo Lesquereux, 1806-1889. A noted worker in American fossil plants and in 

 the mosses. With W. S. Sullivant he published "Iconcs Muscorum;" and with T. 

 P. James, "Manual of the Mosses of North America." These are today two of our 

 best books on North American mosses. 



