Equisetum lyellli Mantell is known from in situ rhizomes and underground portions of aerial shoots in the Wealden ‘soli beds’ of Sussex. Aerial parts including probable sporangiophores and dispersed spores are known from fragment partings above the so called ‘soil beds’ which probably represent an aquatic environment. E. lyellii lacks tubers and was probably wintergreen. Equisetum burchardtii Dunker is known from in situ rhizomes and tubers from the Wealden of England and also underground parts of aerial shoots from the German Wealden. It closely resembles living members of the subgenus Equisetum and probably died down in autumn.
Departments of Botany and Geology, University of Manchester, England
Bibliografia
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