Joerstadia is a genus of rust fungi in the family Phragmidiaceae. The genus contains four species known from Africa, including Madagascar, which grow on Alchemilla plants.
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