Phylum †Pteridospermophyta | Rank Genus | |
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Similar Lyginopteridaceae, Lyginopteridales, Medullosales, Lagenostoma, Sphenopteris |
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 Sparganium cortex. Some Lyginopteris were parasitized by water molds.






References
Lyginopteris Wikipedia(Text) CC BY-SA