40 Charles E. Besscy 



peristome usually double, the outer whorl of i6 teeth. {Muiiim, 

 Rhizogonmui. (P£. I, 3, 603.) 



Family 24. Meeseaceae. Small mosses with 3- to 8-rauked 

 leaves ; capsule long-stalked, drooping ; peristome double, each 

 whorl of 16 teeth. Mccsca. (Pf. I, 3, 626.) 



Family 25. Aulacomniaceae. Medium-sized mosses with 

 drooping, oblong capsules, with a double peristome, the outer 

 whorl of 16 teeth. Aulacouimnm. (Pf. I, 3, 623.) 



Family 26. Bartramiaceae. Medium-sized to large mosses, 

 with papillose leaves; capsule spherical, drooping; peristome usu- 

 ally double, with 16 teeth in each whorl. Bartrainia, Philoiwtis, 

 Brentelia, Catascopiiim. (Pf. I, 3, 631.) 



Family 27. Timmiaceae. Rather large mosses, with crowded 

 leaves, and long-stalked capsules ; peristome double, the outer 

 whorl of 16 teeth, the inner split mto 64. Timrnia. (Pf. I, 3, 

 660.) 



Family 28. Polytrichaceae. Large mosses with thick, costate 

 leaves; capsule long-stalked, erect or drooping, cylindrical or an- 

 gular; peristome single, of 32 or 64 teeth. Catharinia, Pogona- 

 tiim, Polytrichnm. (Pf. I, 3, 669.) 



Family 29. Georgiaceae. Small mosses, with erect capsules, 

 and four-toothed peristomes. Georgia* Tctradontiiim. (Pf. I, 3, 

 667.) 



Family 30. Buxbaumiaceae. Small, thick-leaved mosses with 

 large, oblique capsules ; peristome double, the outer rudimentary, 

 the inner of 16 or 32 teeth. Buxbauniia. (Pf. T, 3, 664.) 



Suborder Pleurocarpi. Spore-fruits terminal upon short lat- 

 eral axes. 



Family 31. Erpodiaceae. Mostly slender mosses of v\^arm cli- 

 mates, with upright regular capsules ; peristome mostly wanting. 

 Er podium. (Pf. I, 3, 706.) 



Family 32. Hedwigiaceae. Mostly strong-growing mosses, 

 with many-ranked leaves ; capsule erect, regular ; peristome none. 

 Hedivigia, Braunia. (Pf.^I, 3, 712.) 



Family 33. Fontinalaceae. From slender to vigorous, mostly 

 aquatic mosses, with 3- to 5-ranked leaves; capsule erect, regular; 



314 



