Abstract
Carboniferous petrifactions known as have long been known from Europe, and much of our knowledge of Carboniferous plants has been derived from a study of these petrifactions. Coal balls have been collected in America, however, but for a comparatively short time. The purpose of this paper is to contribute to our knowledge of this coal ball flora by adding certain new members to the growing list of American Carboniferous plants with structure preserved, with brief anatomical descriptions of the species listed. The plants included in this paper are described from sections of coal balls collected from various localities in Illinois, either by the writer, or by Dr. A. C. Noe, under the authority of the Illinois Geological Survey. All were found in the McLeansboro formation, the approximate time equivalent of the Conemaugh of Pennsylvania.
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