Lepidopteris callipteroides
Lepidopteris callipteroides is a form species for leaves of Late Permian Pteridospermatophyta, or seed ferns, which lived from around 252 million years ago in what is now Australia, and Madagascar. "Lepidopteris callipteroides" was an immediate survivor of the largest Permian-Triassic extinction event, migrating southward with the post-apocalyptic greenhouse spike. Description. In the form generic system of paleobotany "Lepidopteris" is used only for leaves, which in "Lepidopteris callipteroides" is palmate with multiple dichotomies of the rachis. The cuticle of the leaves is thick and has distinctive cuticular structure with stomatal opening overhung by papillae, used to link  the fossil leaves with well preserved ovulate structures of "Peltaspermum townrovii" and pollen organs of "Permotheca helbyi" in the same deposits Atmospheric carbon dioxide paleobarometer. The cuticular structure of "Lepidopteris callipteroides" is comparable to that of modern "Ginkgo", and has been used to estimate past atmospheric carbon dioxide of an astounding 7832 ppm from its stomatal index immediately following the largest Permian-Triassic extinction event.