Article: The lectotype of Sphenobaiera ikorfatensis (Seward) Florin, a ginkgophyte from the Lower Cretaceous of western Greenland
Susannah J. Lydon, Joan Watson and Nicola A. Harrison
Use of the genus Sphenobaiera Florin for deeply divided ginkgoalean leaves lacking a petiole is discussed. The type material of the species Sphenobaiera ikorfatensis (Seward) Florin from the Lower Cretaceous at Ikorfat in West Greenland is diagnosed, redescribed and the lectotype designated. The cuticle, which is described and figured in detail for the first time, shows the leaf to be amphistomatic and allows previous identifications of Sphenobaiera ikorfatensis in Lower Cretaceous floras from Siberia and China to be confirmed.