BARNES NORTH AMERICAN MOSSES. 235 



BRACHYTHECIUM, p. 334. 



I. Seta smooth. 



[B. nanopes and B. mirabundum may be sought here.] 

 * Cilia rudimentary or none. 



Perichaetial leaves costate . . . . B. ac urn in at urn, 1 336. 



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. l)i ventrosnm, 338. 

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



* * Cilia well developed, append iculate. (* * *) 



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



Perichagtial leaves gradually long pointed . . . . B. Mil dean urn, 8 337. 



* * * Cilia well developed, not appendiculate\ 



Annulus compound . ..... . B. collinnm, 339. 



Annulus simple, narrow. 

 Leaves acute or acuminate, serrulate. 

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

 noicous . , . . . . B. salebrosnm, 4 336. 



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, 4 336. 



Dioicous B. glareosnni, 458. 



Appressed imbricate, alar cells quadrate . . B. al Means, 5 337. 



i See Appendix, nos. 455, 456. 

 a See Appendix, nos. 450-452. 



3 B. Mildeanum Sch. = B. salebrosum palustre L. & J. = B. acutum Mitt., sec. Ren. 

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



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

 6 See Appendix, no. 459. 



