A study of arborescent lycopod leaves associated with Lepidodendron selaginoides Sternberg stems in Iowa coal balls

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Abstract
Leaves of arborescent lycopods are abundant in the coal balls of southeastern Iowa. These have been investigated anatomically and found to be all of one general type though of 3 distinct sizes. The medium-size leaves have been found in organic connection with a twig identified as L. selaginoides. Six other spp. of arborescent lycopod leaves are compared with the Iowa material and shown to be different. The authors suggest the use of the arborescent lycopod leaves in micropaleontological stratigraphy since they are small, preserve well, and are diagnostic.

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