Small Petrified Seeds from the Pennsylvanian of Illinois

Abstract

1. An anatomical study has been made of additional, small petrified seeds from two Illinois coal-ball localities. 2. Taxospermum undulatum sp. nov., an ovoid seed with only slight lateral flattening, is included in the Cardiocarpales. 3. Coronostoma quadrivasatum gen. et sp. nov. has structural characteristics which relate it to the seed genera Conostoma and Lagenostoma in the Lagenostomales. 4. Conostoma quadratum Graham, which was originally described only from transverse sections, is more completely described from longitudinal sections which include the region of the lagenostomc and the apical and basal modifications of the integument.