Hypnum. MUSCI. 413 



acuminate, serrulate, areolation hyaline except at the angles ; perichaetial leaves 

 abruptly narrow-acuminate : capsule cernuous, short-ovate, gibbous ; operculum ob- 

 tusely acuminate. Brachythecium collinum, Bruch & Schimp. 1. c., t. 548. 



Yosemite Valley, sterile (Bola.nd.er) ; East Humboldt Mountains, Nevada ( Watson) ; Cascade 

 Mountains (Lyall) ; Rocky Mountains from British America to Colorado and Utah ; Europe. 



12. H. Hillebrandi, Lesq. Small and slender, yellowish; stem erect from an 

 irregularly subpinnately or fasciculately branched base : leaves ovate-lanceolate, 

 long-acuminate, serrulate, the flat margin subreflexed : capsule suberect on a pedicel 

 a half-inch long or more, ovate upon a broad abrupt collum, constricted below the 

 broad oblique mouth when dry : peristome pale yellow below, whitish above, the 

 teeth, processes and ciliolse equal. Mem. Calif. Acad. i. 33. Brachythecium Hille- 

 brandi, Lesq. ; Sulliv. Icon. Muse. Suppl. 98, t. 74. 



On rocks, Merced River, Bolander. 



H. SALEBROSUM, Hoffm., has been collected in Washington Territory and Northern Idaho 

 (Lyall), Northeastern Nevada, and Colorado ; also in the Atlantic States and Europe. It resem- 

 bles H. Icetum, but is stouter, monoecious, and with a turgid gibbous-ovate cernuous capsule. 

 Wilson, Bryol. Brit. t. 55 ; Sulliv. in Gray's Man. 2 ed. t. 5. Brachythecium salebrosum, Bruch 

 & Schimp. 1. c., t. 549. 



H- +* Pedicel roughened. 

 = Monoecious. 



13. H. rutabulum, Linn. Rather stout, loosely cespitose, deep or yellowish 

 green ; stems 3 to 5 inches long, with ascending or erect sparingly divided branches : 

 leaves spreading, broadly ovate-lanceolate, acuminate, serrulate, scarcely sulcate, loosely 

 rhombic-areolate : capsule cernuous or horizontal on a very rough purple pedicel, 

 oval or oblong, subarcuate, with double annulus and large acute-conic operculum : 

 peristome orange-red, pale above, the solitary ciliolse equalling the processes and 

 teeth. Hedw. Muse. Frond, iv, t. 12. Brachythecium rutabulum, Bruch & Schimp. 

 1. c., t. 543. 



West Humboldt Mountains, Nevada ( IVatson) ; common in the Atlantic States and Euroj>e. 



14. H. populeum, Hedw. Yellowish-green and silky; stems 2 or 3 inches 

 long, with ascending or arcuate branches : leaves ovate- or oblong-lanceolate, long- 

 acuminate, serrulate above, margin flat, costa reaching to the apex : capsule ceruuous 

 upon a purple pedicel slightly scabrous above, oval or elliptic, with acute- conic oper- 

 culum and narrow annulus ; peristome yellow, the appendiculate ciliolae frequently 

 imperfect. Hedw. Spec. t. 70 ; Fl. Dan. t. 2564. Brachythecium populeum, Bruch 

 & Schimp. 1. c., t. 535. 



In the Sierra Nevada (Hillebrand) ; Atlantic States and Europe. 



H. DECLIVUM, Mitten, Journ. Linn. Soc. viii. 33, t. 6, found in Northern Idaho (Lyall), has 

 lanceolate long-acuminate falcate-secund serrulate leaves, an oval capsule horizontal and at length 

 pendulous on the rather stout and very scabrous pedicel, the 2 appeudiculate ciliolffi equalling the 

 processes and teeth. 



= = Dioecious. 



15. H. asperrimum, Mitten. Resembling H. Icttum, but with a more rigid 

 stem, the narrower leaves less plicate, and with fewer quadrate cells at the broadly 

 decurrent angles, the pedicel scabrous and the conic operculum long-apiculate ; ciliolae 

 slightly appendiculate, equalling the processes and teeth. Journ. Linn. Soc. viii. 

 33, t. 6. H. vallium, Sulliv. & Lesq. Muse. Am.-Bor Exsicc. 2 ed. n. 506. Brachy- 

 thecium asperrimum, Sulliv. Icon. Muse. Suppl. 100, t. 76. 



On rocks in canons (Bolander) ; British Columbia, Douglas, Lyall. 



16. H. Bolanderi, Lesq. Broadly cespitose, pale green ; branches elongated 

 and flexuous, or suberect and rigid, irregularly subpinnately branched : leaves 

 spreading, ovate-lanceolate, shortly acuminate, margin flat and serrulate, areolation 

 rather loose, narrow and pellucid, the alar ovate-quadrate ; perichsetial leaves abruptly 



