The occurrence of Lycopodites hannahensis Harris in the Yorkshire Jurassic together with details of its anatomy

The herbaceous Lycopodites hannahensis Harris has previously only been described from Lower Cretaceous Wealden Group sandstones of SE England. A new specimen gives the species a second occurrence, this time from Middle Jurassic sandstones of the Yorkshire coast near Long Bight, east of Whitby. It shows a simple dichotomizing stem, and partial pyritization of the axis reveals, for the first time, its stellar anatomy. It is an exarc protostele with several protoxylem points around the larger cells of the central metaxlem, being similar to the central steles of living lycophyte stems. Analysis of a cross section of the stem, using a Pananalytical X'pert Pro materials research Diffractometer, revealed the cell walls to be mainly Fe, probably limonite, and the centres of the cells to be mainly Si