OF WESTERN PENNSYLVANIA 285 



ovate, entire, the apex rounded and sometimes cucullate, the 

 base decurrent; costa slender, reaching nearly to the apex; 

 median leaf-cells large, about .075-.125X-007-.009 mni., linear 

 to sub-hexagonal-linear, pointed, thin-walled, the apical and 

 upper marginal short and wide, the cells towards the base 

 gradually becoming large, wide and more or less hyaline-in- 

 flated, rounded-hexagonal to rectangular, forming a wide but 

 not distinctly bounded group or band reaching clear across 

 the base of the leaf and quite strongly decurrent ; perichsetial 

 leaves erect, sheathing, from an ovate base long-acuminate, up 

 to 2.3-3 mm. long: seta erect, flexuous, usually 4-5 cm. long, 

 castaneous, when dry flattened and dextrorse ; capsule oblong- 

 cylindric, about 3 mm. long, rather turgid-arcuate, inclined to 

 horizontal, castaneous, slightly constricted below the mouth 

 when dry, exannulate ; peristome-teeth pale yellow, rather thin, 

 rather long, hyaline-margined, strongly trabeculate, the dorsal 

 lamellae hyaline and papillose above, the basal portion rather 

 irregularly striate, the teeth confluent at base; the segments 

 entire or but slightly carinately split, about as long as the teeth ; 

 cilia 2 or 3. slender, nodose, about as long as the segments ; 

 the basal membrane about one-half as high as the teeth ; 

 exothecial cells incrassate, rounded-quadrate to rounded-hexa- 

 gonal ; lid conic, acute to apiculate ; spores mature in late 

 spring or early summer, about .012-.015 mm., yellowish, 

 smooth, rather thin-walled. 



In swamps, margins of pools, marshy places, etc. ; Europe, 

 Asia, and in North America from the Arctic region south to the 

 northern United States. Common in the northern part of our 

 region. 



Allegheny : Brush Creek Swamp, near Douthett, Tune 

 5, 1909. O. E. J. 



Cambria : Springy place on mountain-top near 



Lloydsville, July 22, 1908. O. E. J. 



Crawford : Pymatuning Swamp, near Linesville, Mav 



18, 1905, (Figured). O. E. J.; in Sphag- 

 num bog near Hartstown, May 29-31, 

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



Erie : Damp border of lagoon at roots of bushes, 



Presque Isle, June 8-9, 1906. O. E. J. 



McKean : Hedgehog Hollow, Bradford, April 19, 



1895, West Branch Swamp, in stagnant 

 pools. May 26, 1895, and Bennett Brook, 

 on stones bordering stream, July 31, 1896. 

 D. A. B. 



Westmoreland : In cool mountain stream near top- of 

 I. aurel Hill Mountain, New Florence, Sep- 

 tember 8-11, 1907. O. E. J. 



