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Literature
Edwards D., 1970. Further observations in Lower Devonian plant: Gosslingia breconensis Heard.

Cheng-Sen Li, F.M. Hueber. C.L. Hotton, 2000. A neotype for Drepanophycus spineaeformis Göppert 1852. Can. J. Bot 78: 889-902.

Gensel P.G., H.N. Andrews, 1984. Plant Life in the Devonian. Praeger.

Rayner R.J., 1983. New observations on Sawdonia ornata from Scotland.
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Rayner R.J., 1984. New finds of Drepanophycus spineaeformis Göppert from the Lower Devonian of Scotland.
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Stewart W.N., Rothwell G.W., 1993. Paleobotany and the evolution of plants. Cambridge mUniversity Press.

Taylor, T.N., Taylor E.L. & Krings, M. , 2009. Paleobotany: The Biology and Evolution of Fossil Plants [2nd Ed]. New York: Academic Press.