OF WESTERN PENNSYLVANIA 77 



Fayette : Ohio Pyle, September 1-3, 1906. O. E. J. 



and G. K. J. 



Greene : Deer Lick, September 22, 1904. O. E. J. 



McKean : Manila Brook, Bradford, April 1, and 



September 26, 1896. D. A. B. 

 Washington : Valley of Maple Creek, Charleroi, April 



24. 1908, and Hanlin, May 21, 1908. O. 



E. J. 

 \\ estmoreland : "Shades," near Blackburn, March 2;\ 



1910. O. E. J. and G. K. J. 



2. Leucobryum albidum [B ridel] Lindberg. 

 (L. minus Hampe; Dicramim albidum Bridel). 



Much smaller than L. glaucnm: tufts very dense, about 

 1-2 cm. deep; leaves acute, narrower, shorter (about 1- 

 4 mm. long), closely imbricated and but little spreading at the 

 tip : capsule almost symmetric, little or not at all inclined, 

 slightly or not at all strumose. 



On stumps, logs, or on the ground, Europe and in the 

 eastern part of the United States. Rare in our region. 



Huntingdon : Porter. (Porter's Catalogue). 



Westmoreland : A sterile specimen from near Bear Cave. 



Chestnut Ridge, Hillside. September 17, 

 1909. O. E. J. and G. K. J. 



Family IV. FISSIDENTACEAE. 



Autoicous or dioicous : minute to large, gregarious to 

 cespitose. mostly green : stem oval, mostly with central strand, 

 basally radiculose, or with reddish rhizoids from the leaf-axils ; 

 leaves distichous, mostly vertically placed, so that they stand 

 edgewise to the stem with a clasping sheath at the base, or ex- 

 tending well up the leaf, and a dorsal lamina which is often 

 somewhat decurrent, the apical lamina being lacking in the 

 perichaetial and lowest stem leaves and little developed in 

 Bryoxiphium; costa usually present; leaf-cells small, uniform, 

 rounded-hexagonal, chlorophyllose : seta erect or cygneous. 

 usually elongated ; capsule erect and symmetric, or cernuous 

 and unsymmetric or curved, smooth, collum present; annulus 

 present or none; peristome present, except in Bryoxiphiinn, 

 usually inserted, simple, red ; teeth articulate, united at base, 

 cleft to the middle or below into two or three filiform divisions, 

 trabeculate with two series of projecting transverse plates, 

 yellowish ; spores mostly small ; operculum more or less rost- 

 rate ; calyptra small, narrowly conical, entire or cleft on one 

 side, rarely several times cleft, mostly smooth. 



A family of over 600 species, largely tropical, with wide- 

 ly varied habitats, representated in our range by three genera. 



