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AH_Carboniferous seed fern Lyginopteris oldhamia_6358.jpg
Lyginopteris oldhamia (orignally Lyginodendron oldhamia), a Carboniferous seed fern preservd in a coal ball. Cellular structure is still clearly visiable in this fossil dating back to the Carboniferous 359-299 million years ago. Imaged from an antique microscope slide, mounted by Norman. Focus stacked image.