OF WESTERN PENNSYLVANIA 213 



long, leaves not sulcate, plane-margined, sub-clasping at base, 

 acute and almost entire at apex, strongly costate into the 

 apex; basal cells in a wide area, rather thin-walled, large, 

 rectangular to rhombic-oblong, often somewhat brownish, 

 above quickly passing into linear prosenchymatous cells about 

 10-15:1, the apical cells shorter and rhombic oblong; branches 

 densely tufted, ascending to widely spreading, 1.5-2.5 cm. 

 long; branch-leaves about 1.5-2.5 mm. long, broadly lance- 

 ovate, somewhat clasping by the auriculate base with rounded 

 auricles, strongly sulcate, apex obtuse to acute, margin plane, 

 serrate in upper half, strongly costate almost to the apex; 

 median leaf-cells of the branch-leaves oblong-hexagonal, 2-3:1, 

 somewhat incrassate, the basal short rhombic to quadrate- 

 rectangular in the auricles, the median basal longer with 

 rounded ends, incrassate and more or less castaneous-pellucid : 

 sporogonium not seen from our region but described as hav- 

 ing" the seta more flexuous and considerably longer than in 

 C. americannm ; capsule 4-6 mm. in length; peristome-teeth 

 perforate. 



In swamps and pools in woods from New England to In- 

 diana and the Gulf States. Rare in our region. 



Fayette : Along margin of densely shaded mountain 



stream, Meadow Run Valley, four miles 

 south of Ohio Pyle, September 1-3, 1906. 

 O. E. J. and G. K. J. (Figured). 



Family XXVI. LEUCODONTACEAB. 



Dioicous, rarely autoicous : antheridial shoots gemmi- 

 form, axillary; archegonial clusters terminal on short peri- 

 chaetial branches ; both kinds on secondary shoots : paraphyses 

 few, filiform : plants more or less stiff and robust, laxly cespi- 

 tose, mostly shining; stem cylindric, central axis rudimentary 

 or none ; main stem creeping, branched, radiculose with 

 brownish radicles ; secondary stems numerous, erect or ascend- 

 ing, rarely pendent, thickly-leaved, simple or branched ; leaves 

 pluri-seriate, decurrent, often plicate, ovate to lanceolate, 

 abruptly to slenderly acute, non-bordered, one-layered ; costa 

 double or simple or none ; leaf-cells incrassate, mostly smooth, 

 rhombic above, below elongate along the middle of the leaf, 

 towards the margin rounded-quadrate in many series : capsule 

 erect, symmetric, o^'aI or ovate to oblong-cylindric ; annulus 

 present ; peristome double, teeth lanceolate to lance-subulate, 

 densely articulate, non-bordered, mostly papillose, mostly with- 

 out projecting lamellae; basal membrane of inner peristome 

 low, segments rudimentary and narrow or none, as long or 

 shorter than teeth, cilia none; lid conic; obliquely rostrate; 

 calyptra cucullate; spores medium to large. 



