is the reconstruction of the plant Asteroxylon mackiei made bij Kidston
and Lang (1920).
The size of the plant could be up to 50 cms with a stem diameter up to 1
cm. It is the biggest plant in the Rhynie Chert.
The 'leaves' are scalelike like those of the clubmosses. The sporangia are
attached laterally along the stem and for this reason the plant is considered
to be a ancestor of the clubmosses.
The name Asteroxylon points to the star-shaped xylem.
The tracheids of this plant, reinforced with annular and spiral thickenings,
are common. In most cases the cell structure of the softer parts is not present
The cylindrical roots are also rather common.