Stump of a clubmoss tree from the Upper Carboniferous
in the Victoria Park in Glasgow.
The underground parts are called Stigmaria because of the scars
of the appending rootlets (stigma = scar).

Stigmaria ficoides, underground part of a clubmoss tree with appendages and stigmata.
Ibbenbüren (Germany), Upper Carboniferous.
Height of the specimen 7 cm.