TORTULACEAE 43 



lacking, lid falling easily or remaining attached to the columella; 

 calyptra cucullate, extending half way down the capsule. 



Upper leaf cells minute, opaque; margin of leaves plane; operculum 

 falling at maturity rupestre 



Upper leaf cells clear and pellucid, margin of leaf revolute on one side at 

 least; operculum remaining attached to the columella curvirostr e 



All our species of Gymnostomiim grow on wet ledges and cliffs 

 in dense mats or cushions from 1-10 cm. thick. Some one of 

 these species can be found on wet cliffs in almost any region 

 fortunate enough to have the cliffs. 



G. curvirostre (Ehrh.) Hedw. This species is put in the 

 genus Hymenostylium by many recent authors. "Wet rocks, 

 Godwinville, N. J.," Muse. App. 61 ; Little Falls, N. J., Austin, 

 Bx!; Verplancks Point, N. Y., N. L. B., Bx!; "Bath, C. H. Hall," 

 Flora of L. Id. Autumn. 



G. rupestre Schleich. " Damp shaded rocks, rather common," 

 Muse. App., 60; Hohokus and Little Falls, N. J., Austin, Bx! 



Subfamily Barbuleae 



Plants usually with a reddish brown tinge, leaves gradually 

 narrowed to the acute apex (except Barbula imguiculata and 

 Tortella caespitosa). Costa usually vanishing into apex or 

 slightly excurrent. Peristome as in the Tortuleae except that 

 the basal membrane is always narrow. 



BARBULA Hedw. 



Leaves mostly lanceolate from a broader base, somewhat 

 contorted when dry but scarcely crispate, margins revolute; 

 upper cells small, roundish-quadrate, papillose, quadrate to 

 rectangular and transparent to colored at base. Capsule oblong 

 to cylindric, not altering when dry; operculum conic and beaked; 

 peristome of 32 filiform twisted teeth. 



I — Perichaetial leaves long- convolute-sheathing convoluta 



Perichaetial leaves not conspicuously sheathing or different 2 



2 — Leaves usually obtuse and mucronate by the excurrent costa. 



unguiculata 

 Leaves acute, costa not excurrent fallax and reflexa 



