Phylum: Basidiomycota Family: Pucciniaceae
Puccinia calthicola J. Schröt.
A regular rust found on Marsh Marigold
References:

Fungi Outer Hebrides Phylum: Basidiomycota Family: Pucciniaceae
Puccinia calthicola J. Schröt.
A regular rust found on Marsh Marigold
References:
