OF WESTERN PENNSYLVANIA 203 



O. E. J. and G. K. J. 

 Huntingdon : Tussey's Mt., near Baileyville, July 13, 



1909. O. E. J. 

 McKean : Quintuple, April 17, 1898. D. A. B. 



Westmoreland: Mt. Pleasant, August 31, 1903. Katherine 

 R. Holmes, 

 la. Hedwigia ciliata variety leucophaea Bryologia Europaea. 

 (H. albicans var. leucophaea Limpricht). 

 Very hoary ; more robust than the species : leaves more 

 falcate, wider, the hyaline base of the piliferous acumination 

 occupying about the whole upper third of the leaf. 

 With the type and in the same general habitat. 

 Huntingdon : Stone Creek, T. C. Porter. (Porter's Cata- 

 logue). 



Westmoreland: T. P. James. (Porter's Catalogue). 



Family XXIV. FONTINALACBAB. 



Dioicous or autoicous : filiform paraphyses few : slender 

 to robust, aquatic, floating, blackish-green or reddish-brown : 

 stem without central strand, 3-5-angled, or round, much 

 branched but bare below, fastened by a cushion of rhizoids at 

 the base ; leaves 3- and 5-seriate, ovate-acute to lance-subulate, 

 carinate to concave or plane, mostly decurrent, rarely winged, 

 entire or dentate at apex; lamina uni-stratose above, bi- to 

 tri-stratose below, with single costa or none; median leaf- 

 cells mostly elongate prosenchymatous, smooth, the basal 

 orange, laxer, rarely loosely rhombic hexagonal: seta rudi- 

 mentary or normal; capsule erect, non-collumate, without 

 annulus, without stomata; peristome none, single, or double, 

 teeth when present 16, hygroscopic, as long as or shorter 

 than the segments ; mostly linear, orange- to brown-pellucid', 

 non-bordered, mostly papillose, ventrally with projecting 

 transverse trabeculas; inner peristome without basal mem- 

 brane, segments filiform, 16, usually more or less united into 

 a carinate cone, rarely free and appendiculate ; lid short-conic 

 to rostrate; calyptra small and conic or cucullate and reach- 

 ing to below the capsule. 



A family of six genera, confined almost exclusively to 

 the temperate and colder parts of the Northern Hemisphere; 

 two of the genera in our range. 



Key to the Genera. 



a. Leaves ecostate; calyptra short. 1. Fontinalis. 



a. Leaves costate; calyptra enclosing the whole capsule. 



2. Dichelyma. 



1. FONTINALIS Linnaeus, Hedwig. 

 Dioicous: floral branches apparently axillary, very leafy; 

 antheridial clusters short and obtusely gemmiform; arche- 



