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Published online by Cambridge University Press: 01 May 2009
page 273 note 1 These species are described and drawn in the work of Professor Heer, Ueber die foasile Flora der Polarlande.” Zürich; Fr: Schulthess, 1867.Google Scholar
page 276 note 1 This is fully shown in the “Fossilen Flora der Polarländer,” by ProfHeer, , p. 72.Google Scholar