''Lyginopteris'' is a genus of Late Carboniferous seed fern stems with a very distinctive outer cortex of sclereids forming a pattern in cross section like Roman numerals on a clock face, often called a '' Sparganum'' cortex. Some ''Lyginopteris'' were parasitized by water molds, such as the ''

Combresomyces ''Combresomyces'' is a genus of hyphal, parasitic oomycete known from the fossil record; it infects organisms such as the seed fern ''Lyginopteris ''Lyginopteris'' is a genus of Late Carboniferous seed fern A seed is an embryonic plant e ...

''.

References

Pteridospermatophyta Pennsylvanian plants Prehistoric plant genera Pennsylvanian first appearances Pennsylvanian extinctions Fossils of Georgia (U.S. state) {{Carboniferous-plant-stub