222 A MANUAL OF MOSSES 



ulate, distinctly but finely cross-striate in at least the lower 

 half, hyaline and papillose above, castaneous-pellucid below, 

 the dorsal lamellae and the divisural distinct, the trabeculae well 

 developed ; segments papillose, pale yellowish, about as long 

 as teeth, cleft carinately between the articulations ; basal mem- 

 brane one-third as high as teeth ; cilia 2-3, sub-appendiculate, 

 almost as long as segments ; annulus narrow, revoluble, simple ; 

 spores mature in late fall or early winter, smooth, castaneous- 

 pellucid, medium-w-alled, about .016-.018 mm. 



On dripping rocks and ledges along streams in the hills or 

 mountains from Nova Scotia to Minnesota and south to the 

 Gulf States. 



Cambria : Cresson. T. P. James. (Porter's Cata- 



logue). 



Huntingdon : T. C. Porter. (Porter's Catalogue). 



McKean : On stones in or at the edge of streams, 



Hedge-hog Hollow, March 18, 1894, Ben- 

 nett Brook, April 9, 1893 (Figured), and 

 Limestone Creek, N. Y., all near Brad- 

 ford. 



Family XXVIII. ENTODONTACEAE. 



Autoicous or dioicous : slender to quite robust, mostly stiff, 

 laxly cespitose, mostly lustrous ; central strand none or but 

 few-celled; stem thickly-foliate, julaceous or complanate ; 

 leaves pluri-seriate, uni-stratose, often unsymmetric ; costa 

 delicate, homogeneous, never complete, or double and very 

 short, or none ; leaf-cells mostly prosenchymatous, the alar 

 differentiated, being quadrate or transversely widened : capsule 

 exserted, mostly erect and symmetric, never plicate; peristome 

 mostly double, the inner rarely lacking ; teeth yellow to cas- 

 taneous, with divisural, trabeculate, mostly papillose ; segments 

 narrow or lance-subulate, often split carinately, the basal mem- 

 brane low, carinate, the cilia rudimentary or none ; spores 

 mostly small ; lid conic, short- to long-rostrate ; calyptra cucul- 

 late, glabrous. 



Mostly in warmer and temperate regions, on trees, some- 

 times on rocks or on soil : 19 genera, 5 genera in our region. 



Key to the Genera. 



a. Leaf-cells smooth. b. 



a. Leaf-cells more or less strongly papillose. 



d. 



b. Leaves narrowed at base, lower margins revolute. 



2. Entodon. 

 b. Leaves not narrowed at base. c. 



c. Basal membrane of inner peristome almost none: leaves acute, 

 their margins revolute far above the base; branches when dry not 

 strongly curved at the end. 3. Platygyrium. 



