Index filicum, sive, Enumeratio omnium generum specierumque filicum et Hydropteridum ab anno 1753 ad finem anni 1905 descriptorium ? adjectis ... Christensen. Volume Suppl. prelim. 1913-17 - Softcover

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Cet ouvrage est une énumération exhaustive de toutes les espèces de fougères et de plantes similaires répertoriées entre 1753 et 1905, classées géographiquement et accompagnées de leur synonymie. Cette édition supplémentaire de 1913-1917 est un complément précieux pour les botanistes et les amoureux de la nature.

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