OF WESTERN PENNSYLVANIA 65 



thecial cells yellowish, incrassate, irregularly oblong to rec- 

 tangular, the upper 2 to 4 rows much smaller and rounded. 



In crevices of various kinds of rocks, in moist, shady cliffs, 

 etc., rarely in limestone. Mainly in the mountainous dis- 

 tricts of Europe, Asia and America. In North America this 

 species occurs in southern Canada and in northern United 

 States, south to Missouri. Rare in our region. 



JMcKean : Sandstone rocks between Hawkins and 

 Rutherford Hollows, March 12, 1894, and 

 Toad Hollow, July 19, 1896, and August 1, 

 1897. D. A. B. 

 In West Virginia this species occurs on the sandstone 

 cliffs of Chestnut Ridge, 6 miles south of the West Virginia- 

 Pennsylvania State boundary line. July 4, 1909. O. E. J. and 

 G. K. J. (Figured). 

 2. Rhabdoweisia denticulata [Bridel] Bryologia Europsea. 

 Closely similar to R. fuga.v but leaves wider and more dis- 

 tinctly obtuse, more strongly denticulate ; leaf-cells in 7 to 

 10 rows on each side of the costa in the upper part of the 

 leaf; peristome-teeth more persistent. 



We have seen no specimens of this species from our 

 region, although it has been reported as follows : 



Lawrence: Slippery Rock Creek. James. (Porter's Cata- 

 logue). 



9. ONCOPHORUS Bridel. 



Autoicous : rather large, cespitose in broad, soft, bright 

 green or yellowish-green tufts, usually radiculose below : 

 stems thickly foliate ; leaves when dfy crisped, when moist 

 ascending to squarrose, from a sheathing base more or less 

 abruptly long-acuminate or subulate, concave, carinate; costa 

 strong, percurrent or excurrent; cells in the sheathing base 

 of the leaf long-rectangular, translucent to hyaline, the alar 

 differentiated, the laminal cells small, mostly rounded- 

 quadrate, at the margin bi-stratose ; perichsetial leaves sheath- 

 ing to above the middle, abruptly subulate: seta long, erect; 

 capsule unsymmetric, strumose with a short collum', when 

 empty more or less weakly sulcate; annulus indistinct; peris- 

 tome-teeth 16, deeply inserted, approximate, united below into 

 a tube which is adherent to the wall of the capsule, the teeth 

 2-(3)-divided to the middle, outwardly minutely papillose 

 in longitudinal lines, the inner surface with 1 (or 2) delicate 

 longitudinal lines and strongly projecting transverse plates; 

 operculum at least half as long as the capsule, obliquely 

 rostrate; calyptra cucullate. 



A genus of 9 species widely distributed on damp gravelly 

 soil, on moist non-calcareous rocks, or on decaying logs.. Only 

 one species in our range. 



