We have not found any fossils worth mentioning of the clubmoss tree Lepidodendron. The clubmoss trees were in fact declining during the Stephanian.
When the outer bark has disappeared, a trunk with vertical grooves remains, with pairs of scars sitting in between (like footprints of a hare) which come from air channels in the trunks. The kind of preservation is called Syringodendron (click on the photo on the right). When the bark has disappeared still more and only the ridges remain.
We have not seen any spore cones nor branches with leaves of clubmosses.