ADDITIONAL OBSERVATIONS ON STEPHANOSPERMUM OVOIDES,A MIDDLE PENNSYLVANIAN SEED

Taylor , Thomas N. (U. Illinois, Urbana.) Additional observations on Stephanospermum ovoides, a Middle Pennsylvanian seed. Amer. Jour. Bot. 49(7): 794–800. Illus. 1962.—Recently additional specimens of Stephanospermum ovoides have been discovered in coal-ball material collected at the New Delta Mine, Absher, Williamson County, Illinois. Stephanospermum ovoides is a radially symmetrical ovoid seed, characterized by a low sclerotestal crown and micropylar beak. The species stands intermediate in relation to other members in the genus in its sclerotestal elaboration, which is assumed to be reflected in the size of the crown and mieropylar beak.