108 A MAXUAL OF MOSSES 



capsule erect, oval ; peristome-teeth 16, long-subulate, articu- 

 late, papillose; lid erect, conic-subulate, about as long as urn; 

 calyptra long-rostrate, mitrate, plicate-lobed to base of beak, 

 covering a little more than half of the lu^n ; spores mature in 

 spring. 



On more or less exposed calcareous rocks from Con- 

 necticut to Georgia and Texas. Not uncommon in Eastern 

 Pennsylvania, Northern Ohio, and Western New York, and 

 probably will be found eventually in our region. 



2. GRIM MIA Ehrhart, Hedwig. 



Autoicous or dioicous : forming cushions and mats, slender, 

 often hoary by reason of the hyaline leaf-apices : stem erect or 

 ascending, mostly with a central strand, radiculose mainly at 

 the base, thickly-leaved ; leaves imbricate when dry, rarely 

 crispate or spirally appressed, spreading to recurved-squarrose 

 when moist, lower often small and bract-like, the upper often 

 suddenly larger, often hyaline-piliferous, carinate, concave, 

 sometimes canaliculate, mostly lanceolate from an oblong or 

 ovate base, acuminate, entire, margins plane or revolute ; costa 

 complete or extending to the base of the piliferous apex ; upper 

 cells small, rarely papillose, rounded-quadrate, often opaque, 

 looser towards the middle, the basal linear to rectangular and 

 sometimes forming a colored border ; perichsetial leaves most- 

 ly larger, more or less sheathing, areolation looser : seta some- 

 times shorter than the capsule, rarely much longer than the 

 perichsetial leaves, arcuate or straight, mostly yellow, twisted 

 when dry, capsule mostly symmetric, smooth to ribbed, globose 

 to Cylindric ; annulus persistent or curling off, sometimes none ; 

 peristome rarely absent, when present inserted below the 

 mouth ; teeth reddish-brown, broad to subulate, entire to crib- 

 rose, sometimes cleft to the middle, the trabecule projecting 

 outwards ; operculum often rostrate, never longer than the 

 urn ; calyptra lobed-mitrate to cucullate, long-rostrate, smooth ; 

 spores small. 



A large genus of world-wide distribution, but mainly 

 confined to the mountains of the tropics, occurring on rocks 

 and stones. About 240 species, of which some 70 occur in 

 North America and at least 4 in our region. 



Key to the Species. 

 a. Seta not longer than the capsule; operculum mostly falling with 



the columella still attached. b. 



a. Seta longer than the capsule. f. 



b. Apices of upper leaves with short hair-points. 



c. 

 b. Apices of upper leaves long-piliferous. e. 

 c. Lower leaf-cells with sinuouse walls. 4. G. pennsylvanka. 



c. Lower leaf-cells not with conspicuously sinuose walls. 



d. 



