Definition of stigmaria in US English:



  • A fossilized root of a giant lycopod, common in Carboniferous coal measures.

    Class Lycopsida, in particular the genera Lepidodendron and Sigillaria

    • ‘The rhizomes, or root systems, of both genera, known as stigmariae, were thought to be distinct plants when their fossils were first discovered.’
    • ‘Stigmariae are most often found in layers of clay below coal seams; the clay layer is thought to represent the layer of soil below the coal swamps.’
    • ‘The round nodes on the surface of the stigmaria are scars where ribbon-like rootlets were once attached and arranged radially about the stigmaria like the bristles of a bottle brush.’


Mid 19th century: modern Latin, from Greek stigma, with reference to the scars where rootlets were attached, covering the fossils.