Identification table for some
species of Sigillaria

The clubmoss tree Sigillaria

The clubmoss trees of the genus Sigillaria formed an important part of the coal swamps in the Late Carboniferous. They could reach a height up to 30 ms and bore grasslike leaves in the upper part of the unbranched or once divided trunk. The leaves were attached directly to the stem and they left scars when they were shed.
Characteristic of the genus of Sigillaria is the fact that the leaf scars were arranged in vertical rows. On the ground of these leaf scars many species have been described.
The trunk was somewhat thickened at the base.
The spore-cones were attached in or under the crown directly to the stem. They are called Sigillariostrobus.
The underground parts of the tree can hardly be distinguished from those of Lepidodendron and they are called Stigmaria.
From the Westfalian D on the number of species of Sigillaria diminished strongly.
Click the parts of the tree to see photos of fossils.
Possibilities:
underground parts, trunk, base of the trunk (syringodendron), leaves, spore-cones.