Abstract
Petrified specimens of pteridosperm foliage assignable to Reticulopteris muensteri (Eichwald) Gothan and Neuropteris rarinervis Bunbury were found in a Middle Pennsylvanian age coal ball from central Iowa. The presumed close affinity of these two foliage taxa is supported by various anatomical similarities including hydathode-like vein terminations and non-papillate lower epidermises with high stomatal density. Comparison of the foliar anatomy of these neuropterids to that of the xeromorphic taxa Alethopteris sullivanti (Lesquereux) Schimper and A. lesquereuxi Wagner show striking differences which suggest that these neuropterid and alethopterid taxa were adapted to markedly different habitats.
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