Hooker, W.J. 1851–1858. Species Filicum being descriptions of the known ferns, particularly of such as exist in the author's herbarium, or are with sufficient accuracy described in works to which are he has had access; accompanied with numerous figures Volume II containing Adiantum – Ceratopteris. v + 250 pp. + 70 tab. London: William Pamplin. BHLBiblioteca DigitalMDZReference page.