13 



Alet. 



Alethopteris pennsylvanica. Lesquereux, Coal Flora, p. 



. • XIII. 







PI 11 



181; Bost. Jour. S. N. H. Vol. 6,p. 423 ; Geol. Pa. 1858, p. 864, 

 pi. XI, figs. 1,2; Geol. Rt. 111. IV.; Schimper, I., 562. Has 

 the general look of A, lielencB ; and Schimper compares it with 

 A. grandmi of Brogniart. Lesquereux found it in the Salem 

 anthracite bed at Pottsville, Pa. ; in M. Lacoe's collection at 

 Pittston, Pa , labeled Mai tby. Pa. ; and one poor fragment from 

 the Morris coal, 111. In the Broad Top coal field of Hunting- 

 don county, this fern, or one very closely allied to it, makes 

 up almost the whole flora of the roof shale of the Cook (= 

 Fulton bed == bed B) at Powelton, also in the Ocean mine 

 tunnel. I. C. White in Report T3, pp. 61, 62; the same 

 abundance and exclusiveness (perhaps with a few A. serlii) 



