LESKEACEAE 75 



3 — Plants very small, 1-2 cm.; stem and branches filiform, branches 



papillose; growing in thin mats on limestone rocks pygmaeum 



Plants small, 2-4 cm.; loosely caespitcse; branches smooth; growing 



on the ground and rotten wood miniitulum 



4 — Stems closely pinnately branched, branches terete-foliate when dry ... 5 



Stems loosely pinnately or bipinnately branched 6 



5 — Plants soft; leaf cells with 2-5 small papillae on each surface. . . . scitum 



Plants rigid; leaf cells with a single papilla on each surface abietinum 



6 — Pinnate or bipinnate; stem leaves spreading-recurved when moist, 



costa subpercurrent; perichaetial leaves not ciliate recognition 



Bipinnate or tripinnate; stem leaves erect spreading when moist, 



costate to 4/5 ; perichaetial leaves ciliate delicatidum 



Bipinnate; stem leaves with a hyaline filiform acuminatiori; peri- 

 chaetial leaves scarcely ciliate Philiberti 



7 — Stem leaves roundish ovate, abruptly linear-oblong-acuminate, 



margins erose-serrate virginianum 



Stem leaves broadly ovate, long and narrowly acuminate, margins 

 crenulate-serrulate or entire microphyllum 



T. abietinum (L.) B. & S. "On dry limestone ridges, Sussex 

 Co., N. J., very abundant," Muse. App. 304; Yonkers, E. C. 

 Howe, Bx! 



T. delicatulum (L.) Mitt. On shaded rocks and banks; 

 common. Winter. 



T. microphyllum (Sw.) Best. " Woodbridge," Bry. Ct. 



T. minutulum (Hedw.) B. & S. "On decayed wood in 

 swamps; common," Muse. App. 297; Pleasant Plains, Court 

 House and Woods of Arden, Mosses of S. Id.; Closter, Austin, 

 and New Brunswick, N. J.; Vail. Autumn. 



T. paludosum (Sull.) Rau & Hervey. Frequent in wooded 

 swamps. Winter. 



Var. elodioides (R. & C.) Best. Wet meadow, Oyster 

 Bay, L. Id.!! 



T. Philiberti Limpr. "Base of small trees in wet places, 

 Stockton, N. J." G. N. Best, Bx! 



T. pygmaeum B. & S. Closter, N. J., Austin, Bx! 



T. recognitum (Hedw.) Lindb. This is reported from Rich- 

 mond Hill and Northport, L. Id., from S. Id. and from N. J., 

 but the identification of the specimens is uncertain. 



