Murdock (de Vriese) 2008 - Murdock AG (2008) A Taxonomic Revision of the Eusporangiate Fern Family Marattiaceae, with Description of a New Genus Ptisana. Taxon 57(3): 737-755. Retrieved from http://www.jstor.org/stable/27756705
There is no corrections for Ptisana purpurascens yet.