Plate XXXIV. FILICALES: PECOPTERIDAE 



1. Pecopteris unita Brongniart, from Mazon Creek, U I Coll. No. 



P 1300. 



2. The same, x 3/1. 



3. Pecopteris miltoni Artis, from Mazon Creek, K Coll. 



4. Pecopteris miltoni Artis, from Mazon Creek, U C Coll. No. 32046. 



86 



