PLATE XXXI. 

 Pecoptebis pseudovestita D. W. 



(Page 85.) 



s. 1. Portion of lateral pinna similar to those in PI. XXIX. This specimen is one of the originals 

 illustrated in pi. xxxi, tig. 2, of the Coal Flora as Jleihopteris ambigua Lx. Lacoe collec- 

 tion, U. S. Nat. Mus., 3093. 

 Irt. Pinnule from same specimen enlarged. X2. 



2. Pinn;e of the same species, in which the sori are in the process of development on the under 



surface of the pinnules and the lamina is slightly reduced. This example also was 

 labeled as Aleihopteris anibigna by Professor Lesquereux. Lacoe collection, U. S. Nat. Mus., 

 3097. 

 2(1. Enlarged detail of pinnules of the same. x2. 



3. Fertile pinna' supposed to be referable to the same species. U. S. Nat. Mus., 5809. 



3o. Photographic enlargement of a portion of the same species. The oblong sporangia of Astero- 

 Iheca are dimly indicated. x2. 



372 



