BARNES — NORTH AMERICAN MOSSES. 235 



BRACHYTHECIUM, p. 334. 

 I. Seta smooth. 



[B. nanopes and S, tnirabunduni may be sought here.] 



* Cilia rudimentary or none. 



Perichaetial leaves costate .... B. acuminatum/ 336. 



Perichaetial leaves ecostate. 

 Inflorescence synoicous ..... B. Utahense, 339 . 



Inflorescence dioicous or monoicous. 

 Capsule oval, cilia none ..... B. Donnellii, 338. 

 Capsule cylindric oblong. 

 Leaf costate to middle, basal cells very small B. biventrosum, 338. 

 Leaf costate % the length, basal cells dilated B. Isevisetum, 469. 



* * Cilia well developed, appendiculate. (* * *) 



Perichaetial leaves abruptly long pointed . . . B. laetum,* 335. 

 Perichsetial leaves gradually long pointed . . B. Mildeanum,* 337. 



* * * Cilia well developed^ not appendiculate. 



Annulus compound ...... B. collinum, 339. 



Annulus simple, narrow. 

 Leaves acute or acuminate, serrulate. 



Leaves straight when dry, capsule short (1-1.5), mo- 

 noicous B. salebrosum,* 336. 



Leaves twisted flexuous when dry, capsule short, 



(1 : 1.5-2) B. Thedenii, 338. 



Leaves acute or acuminate, entire or slightly serrate at apex only. 

 Open, alar cells oblong. 



Monoicous B. salebrosum,* 336. 



Dioicous B. glareosum, 468. 



Appressed imbricate, alar cells quadrate . . B. albicans,^ 337. 



1 See Appendix, nos, 455, 456. 

 " See Appendix, nos. 450-452. 



' B. Mildeanum Sch. = B. salebrosum palustre L. & J. = B. acutum Mitt., sec. Een. 

 & Card. Rev. Bry. 30: 17. 1893. 

 < See Appendix, nos. 461, 462, 463. 

 ' See Appendix, no. 459. 



