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Filices africanae : revisio critica omnium hucusque cognitorum cormophytorum Africae indigenorum additamentis Braunianis novisque africanis speciebus ex reliquiis Mettenianis adaucta : accedunt filices Deckenianae et Petersianae 53. 1868. (Jan-Mar 1868) (
Filic. Afr.)