72 PP. REPORT OF PROGRESS. FONTAINE & WHITE. 



Htibitat. — Roof shales of the Waynesburg Coal, Cassville, 

 West Virginia. 



Pecopteris imbricata. Sp. nov., PL XXIII, Fig. 1. 



(Frond tripinnate, and large, with a stout and rough pri- 

 marj'- rachis ; pinnae alternate, and going off at nearly a 

 right angle, linear-lanceolate, and terminated by an obo- 

 vute, or oblong-elliptical pinnule ; pinnules apparently im- 

 bricated by the adjacent edges nearly to their summits. 

 Very obtuse at the apex ; middle nerve well defined, side 

 nerves simple, and passing off at an angle of about 45°. 



The basal pinnule on the lowest side is often inserted 

 partly, and sometimes almost wholly, on the primary 

 rachis. 



This plant resembles very much P. adiantoides^ L. & H. 

 in some of its features, but differs from it in the imbrica- 

 tion of the pinnules, in the mode of departure of the lateral 

 nerves from the median nerves of the pinnules, and in its 

 more densely crowded appearance. The pinnae themselves 

 are often imbricated. 



Habitat.^ — Roof shales of the Waynesburg Coal, Cassville, 

 West Virginia. 



Pecopteris asplenioides^ Sp. nov., PL XXV, Fig. 1. 



(Frond, tripinnate ; primary rachis, strong and rough ; 

 pinnae, close, and densely crowded, alternate, and going oft" 

 at nearly a right angle ; pinnule, alternate, ovate-oblong, 

 and slightly contracted at the base, crowded closely to- 

 gether on the strong secondary rachis ; primary nerves of 

 the pinnules well marked, and extending to the a^iex ; sec- 

 ondary or lateral nerves going off at an acute angle, fork- 

 ing once near the insertion, and each branch forking again 

 near the margin of the xjinnule ; fertile pinnules on the 

 same pinnae intermingled with the sterile ones ; fructifica- 

 tion, arranged in two rows, composed of linear- elliptical 

 sori which are inclined to the mid-nerve at an angle of about 

 60°, and extend from it to the margin of the pinnule.) 



The sori appear to be placed on the lateral nerves. The 

 resemblance of the fructification to that of Asplenium has 



