LESKEACEAE 79 



5 — Leaves somewhat crisped when dry with points incurved, not de- 

 current, having large nmbriate-papillose auricles, often apiculate. 



apiculatus 

 Leaves scarcely contorted when dry, somewhat irregularly appressed, 

 decurrent, without auricles, not apiculate minor 



A. apiculatus B. & S. " Jordansville, N. Y. f " Austin, Bx.! 



A. attenuatus (Schreb.) Hueben. "About the roots of trees 

 and on rocks, common," Muse. App. 274; New Lots, Jamaica, 

 and Greenport on Long Id.; New Dorp, Bloodroot Valley and 

 Tottenville on S. Id.; Williamsbridge, Bedford, East Chester 

 and Yonkers, N. Y. Autumn-winter. 



A. minor (P. B.) Fuern. "On roots of trees and on rocks, com- 

 mon," Muse. App. 275; Closter, N. J., 276 (as var. fragilis); 

 New Lots (26295) and Jamaica (26294), Long Id., Brainerd; 

 Bloodroot Valley, S. Id.!! Late autumn to winter. 



A. rostratus (Hedw.) Schimp. About roots of trees, etc., 

 in damp places, common. Autumn. 



A. tristis (Cesat.) Sull. "On trees and rocks, common, 

 always sterile," Muse. App. 273; New Dorp, S. Id., and Bronx 

 Park, E. G. B., Bx!; Closter, N. J.,!! N. Am. Muse. PI. 195. 



A. viticulosus (L.) Hook and Taylor. "On limestone rocks, 

 Sussex Co., N. J." Muse. App. 278. 



THELIA Sull. (Plate IX, Fig. 2.) 



Plants of this genus as a rule are easily recognized by the light 

 color, very light to glaucous- green, and the rather short crowded 

 julaceous stems from creeping primary stems. In depauperate 

 or very young plants the branches are often scattered. Under 

 the microscope the most striking thing is the enormous single 

 papilla on the back of each leaf cell. The costa is usually single 

 and extends about half the length of the leaf. Capsules ovoid- 

 cylindric, operculum beaked ; outer peristome teeth conspicuously 

 whitish, slender; inner of a well developed basal membrane with 

 segments very rudimentary or none. 



I — Growing on rather dry sandy soil, rarely on bases of trees Lescurii 



Growing on the base of trees, never on the ground .' . . . 2 



2 — Plants distinctly glaucous; leaf papillae forked asprella 



Plants scarcely or not at all glaucous; papillae simple hirtella 



