OF WESTERN PENNSYLVANIA 123 



On non-calcareous rocks, mainly in hilly or mountainous 

 regions; Europe, Asia, and from Xew Brunswick to Georgia 

 and west to the Rocky Mountains. Common in our region. 



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



logue). 



Center : Dry rocks at top of Bald Eagle Mt., near 



Matternville, July 14, 1909. O. E. J. 



Fayette : On rocks in bed of Youghiogheny River 



at Ohio Pyle, September 1-3, 1906. O. E. 

 J. and G. K. J. 



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



McKean : On rocks, Rutherford, May 13, 1898. D. 



A. B. 



Somerset : On dry, crumbling shale, Ursina. May 



12. 1905. O. E. J.' (Figured). 



2. Ulota ludwigii (Bridel) Bridel. 



(Weissia coarctato Lindberg) 



(Plate XV) 



Loosely cespitose, yellowish green: stems more or less 

 creeping with erect shoots often 1 cm. high, usually shorter, 

 somewhat branched below ; leaves erect-spreading but slightly 

 twisted when dry, lance-ovate to lanceolate, concave at base, 

 often carinate-concave in upper third, acuminate above but 

 the extreme apex rather obtuse, the margin entire and often 

 recurved; costa strong, reddish, sub-percurrent ; basal leaf-cells 

 at margin quadrate, hyaline, towards the costa rectangular to 

 linear-vermicular, reddish-pellucid, the median cells rounded- 

 quadrate, incrassate, slightly papillose, the apical cells similar; 

 capsule pyriform, tapering into a slender dextrorse seta, seta 

 and capsule together about 3.5 mm. long, capsule strongly 

 costate but with a very small mouth and, even when dry, 

 smooth and plicate only immediately below the mouth, pale 

 yellowish-brown, stomata superficial at the base of the urn; 

 calyptra narrowly conic-mitrate, hairy ; lid rostellate ; peri- 

 stome single, or rarely with rudimentary segments, teeth some- 

 what paired but split apart above, when dry erect, narrowly 

 triangular, granulose, distinctly articulate, with a distinct 

 divisural ; spores papillose, globose, about .020-.022 mm. in 

 diameter, mature in summer. 



On tree-trunks in woods, usually in mountainous or hilly 

 country ; Europe, and in North America from the Gulf of St. 

 Lawrence to Ontario and south to North Carolina. Rather 

 uncommon in our region. 



Center : Bear Meadows. T. C. Porter. (Porter's 



Catalogue). 



