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doi:10.4154/gc.2015.11 New collections from the spoil piles of the Theodor mine in Pchery and the Schoeller mine in Libušín (Kladno-Ra-kovník Basin, Czech Republic) yielded a new Cordaites species and improved knowledge of the extent of the cu-ticular variability of the species Cordaites wartmannii ŠiMůNeK. Based on the cuticles, it has been proven that the species Cordaites polynervus ŠiMůNeK is conspecific with Cordaites kladnoensis ŠiMůNeK. The new species, Cordaites theodorii ŠiMůNeK & HaLdovSKý sp. nov., established on strongly papillate cuticles, is character-ized by the presence of small teeth on the leaf margin. This feature is new for the genus Cordaites. The palaeoeco-logical significance of papillae on Cordaites cuticles is discussed and is probably an adaptation to living on a peat substrate. Comparison of the species Cordaites wartmannii ŠiMůNeK and Cordaites barthelii ŠiMůNeK is made. Adaxial cuticles of Cordaites kladnoensis and Cordaites wartmannii are so similar that it is difficult to distinguish these species by means of the adaxial cuticle alone

Contribution to the knowledge of Cordaites species from the Kladno-Rakovník Basin, Middle Pennsylvanian (Bolsovian), Czech Republic