Stigmaria ficoides (Brongniart) 1822.
Part of the rootstock of a giant Lycopod tree. All the depressions on the surface are where rootlets would have been attached. Really nice example.
Upper Carboniferous, Westphalian.
Marles les Mines, Pas de Calais, France.
Specimen : 6 x 6 x 3 cm.
