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Fossil plants previously reported as hvo species of Tingia Halle provide the basis for description of the new genus Russellites, typified by R. taeniata (Darrah) l\lamay, new combination. The material is from the Lower Permian Belle Plains Formation, Baylor County, Tex. Russellites is distinct from Tingia in lacking anisophylly and in having uniquely truncated laminar apices. The foliar organs of Russellites are interpreted as pinnate leaves (fronds) rather than plagiotropic shoots, as in Tingia. Affinities of Russellites most probably lie within the Noeggerathiales. Russellites promises to be valuable as a guide fossil, and possibly as a facies indicator. It constitutes an important element of contrast between the Permian floras of North America and Asia, and adds to the evidence for rapid botanical evolution during Permian time.

Russellites, new genus, a problematical plant from the lower Permian of Texas