The supposed fern Onychiopsis psilotoides from the English Wealden (Lower Cretaceous) reinterpreted as a lycopod

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Abstract
Specimens that had been previously considered to represent a fertile fern, Onychiopsis psilotoides (Stokes et Webb) Ward from the English Wealden, have been restudied and are here considered to represent a new genus (Tanydorus) in a new familY [Tanydoraceae] within the Lycopodiales. Evidence for this new classification of the material includes the combination of a spiral (helical) arrangement of the leaves, presence of an elongated sporangium in the axial of a sporophyll, distinct strobilus borne on the sterile basal portions, and structure of the numerous homosporous spores. The combination of elongated sporangia and details of spore ultrastructure preclude placement in the only family currently assigned to this order, the Lycopodiaceae.

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