non Dicksonia arctica Heer (in Mém. Acad. Imp. Sci. Saint Pétersbourg, Sér. 7, 25(6): 12. Jun 1878); the basionym was incorrectly given in 1978 as "Coniopteris arctica", but since the full reference with correct pages and plates was correctly provided, the resulted combination is treated as validly published.