Abstract

Introduction

Among the extensive collections from the Des Moines series, or Lower Coal Measures, of Missouri, sent during the last few years to the United States National Museum or the United States Geological Survey, is a series of specimens which throw much interesting light on the unique and somewhat problematic species described by Professor Lesquereux as Lepidodendron cyclostigma.

Pitcher’s coal mine, in Henry county, the source of most of the new material, seems, as indicated both by the associated species and by the matrix, to have been the source of the types of the original species, now numbers 5501 and 5502 of the Lacoe collection in the National Museum. In any event it is certain, as is shown by the records and labels, that the fossils described by Lesquereux came from the same vicinity. The species has not been found elsewhere.

Since the recently acquired material includes examples exhibiting many . . .

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