Lyginopteris

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]

Lyginopteris Temporal range: Late Carboniferous PreꞒ Ꞓ 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
Clade:	Tracheophytes
Division:	†Pteridospermatophyta
Class:	†Lyginopteridopsida
Order:	†Lyginopteridales
Family:	†Lyginopteridaceae
Genus:	†Lyginopteris (Binney) Potonie 1899
Species
Lyginopteris austriaca Lyginopteris heterangeoides Lyginopteris lacunosa Lyginopteris oldhamiana Lyginopteris royalii