Ryvardenia is a genus of fungi in the family Polyporaceae. It contains two species, Ryvardenia campyla and the type, R. cretacea, formerly placed in the genus Polyporus. Ryvardenia was circumscribed by Argentinian botanist Mario Rachenberg in 1994.
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0