Callipteridium is an extinct genus of pteridospermous seed ferns belonging to the family Cyclopteridaceae. These ferns existed in the Carboniferous period.
References
Georges Basement Gilbert A. Leisman The Morphology and Anatomy of Callipteridium Sullivanti American Journal of Botany - Vol. 47, No. 4 (Apr., 1960), pp. 281–287