338 BRYACE^. [Hypnum. 



the apex ; perichaetiiil leaves narrowed into a long filiform point : 

 capsule small, ovate, turgid, horizontal or inclined, subcernuous, 

 brown, becoming black when old ; peristome normal ; annulus 

 narrow. — Metli. Muse. 180; Muell. Syn. ii. 360. Brachythe- 

 cium albicans^ Bruch & Schimp. Bryol Eur. t. 553. 



Hab. Grassy sandy ground in mountains; Eocky Mountains [Bour- 

 geau); Uinta Mountains, and Ca?ur d'Alene Lake, N. Idaho (Watson). 



40. H. biventrosum, Muell. Dioecious: i^lants small, 

 loosely cespitose, bright green ; branches very short, slender, 

 curved : stem-leaves close, erect, open, small, scarcely decurrent 

 at base, ovate-acuminate, not plicate, but ventricose at base on 

 both sides of the costa, recurved on the borders at the base 

 only, denticulate all around, costate to the middle ; alar cells 

 very small, chlorophyllose ; inner perichietial leaves sheathing 

 at base, more or less abruptly narrowed into a filiform reflexed 

 ]-)oint, ecostate : capsule small, cylindrical-oblong, not curved ; 

 lid conical, very shortly apiculate ; teeth narrow; segments 

 split ; cilia rudimentary. — Bull. Torr. Club, v. 49, and Regensb. 

 Flora, Iviii. 90. Brachythecium sjylendens, Aust., Coult. Bot. 



Gaz. ii. 111. 



Hab. Deep woods near Baton Rouge, Louisiana {Joor) ; on Talmetto 

 trunks, St. Augustine, Florida (J. Donnell Smith). 



In aspect like small forms of H. IcBtum. 



41. H. Thedenii, Hartm. Dioecious: plants slender, loosely 

 cespitose ; stems very long, creeping, pinnately ramulose : leaves 

 loose, erect, open, homomallous or falcate-secund, long, filiform- 

 acuminate from an ovate-lanceolate base, obliquely uncinate, 

 flexuous above when dry, serrulate all around, plicate, narrowly 

 costate to below the apex ; inner perichretial leaves very long, 

 filifornvacuminate, serrate : capsule abruptly horizontal, short- 

 ovate, turgid ; operculum convex-conical, apiculate ; peristome 

 large ; teeth coarsely articulate above ; segments and cilia (2) 

 as long as the teeth, the latter marked with prominent articula- 

 tions ; annulus simple. — Skand. Fl. ed. 9, 11. BrachytJiecmm 

 Thedenii, Bruch & Schimp. Bryol. Eur. t. 551. H. albicans, 

 var. Thedenii, Hartm. 1. c, ed. 10, 15. 



Hab. Erroll Dam, Androscoggin River, New Hampshire (James). 



42. H. Donnellii, Aust. Monoecious : plants small, com- 

 pressed, cespitose, bright or yellowish green, shining; stems 

 slender, creeping, flexuous, with short thick simple brandies : 



