Sori in dead fruits of the host plant, infecting and destroying the seeds. Spore mass granular, dark reddish brown. Spore balls 37-52 (-58) µm, ± globose, persistent, containing (7-) 10-12 (-15) ustilospores. Ustilospores 16-19 µm diam., angular, the contiguous surfaces flat and smooth, the exposed surfaces coarsely verrucose.
Not formally assessed, but the species has only been reported once from GBI and the host plant is threatened by intensice agricultural practices.
In dead seed pods of Astragalus glycyphyllos.
One report from VC22 Oxfordshire.