Lyginopteris

Lyginopteris Temporal range: Late Carboniferous PreЄ Є O S D C P T J K Pg N
Permineralized stem Lyginopteris oldhamiana from coal ball of Late Carboniferous Six Inch Coal in Hough Hill Colliery near Stalybridge, England
Scientific classification
Kingdom:	Plantae
Phylum:	†Pteridospermophyta
Order:	†Lyginopteridales
Family:	†Lyginopteridaceae
Genus:	Lyginopteris (Binney) Potonie 1899
species
Lyginopteris austriaca Lyginopteris heterangeoides Lyginopteris lacunosa Lyginopteris oldhamiana Lyginopteris royalii

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.^[1]

References

1. Strullu-Derrien, C.; Kenrick, P.; Rioult, J. P.; Strullu, D. G. (2010). "Evidence of parasitic Oomycetes (Peronosporomycetes) infecting the stem cortex of the Carboniferous seed fern Lyginopteris oldhamia". Proceedings of the Royal Society B: Biological Sciences 278: 675. doi:10.1098/rspb.2010.1603.