Name: Lepidodendron aculeatum
Age: Carboniferous, Stephanian stage
Origin: Auzin, France
Size : 18 × 10.5 × 3 cm

This fossil plant comes from an old collection and the slab measures 18 cm in its longest. The slab is very nice and the preservation is outstanding for that kind of fossil.
Plants of that quality are rare in carboniferous deposits.