Two Wealden species of Equisetum found in situ
Joan Watson
Equisetum lyellii Mantell is known from in situ rhizomes and underground portions of aerial shoots in the Wea den soil 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.
Key words: Equisetum, taxonomy, ecology, Wealden, England.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (for details please see creativecommons.org), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Full text (416.8 kB)