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Answer for the clue "Genus of fossil seed ferns of the Carboniferous ", 12 letters:
lyginopteris

Word definitions for lyginopteris in dictionaries

Wikipedia Word definitions in Wikipedia
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 ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Lyginopteris \Lyginopteris\ n. A genus of fossil seed ferns of the Carboniferous. Syn: genus Lyginopteris .