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Kidston, R. & Lang, W.H. 1920. XXIV. - On Old Red Sandstone Plants showing Structure, from the Rhynie Chert Bed, Aberdeenshire. Part II. Additional Notes on Rhynia Gwynne-Vaughani, Kidston and Lang; with Descriptions of Rhynia major, n.sp., and Hornea Lignieri, n.g., n.sp. Trans. Roy. Soc. Edinburgh 52 (3), Sep (sep. 20 Jan) 1920: 603-627, pls. I-X. ≡