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.

[1]

This article related to a Carboniferous plant is a stub.

You can help Wikipedia by expanding it.