Spermogonia: not known.
Aecia: not known.
Uredinia not differentiated, urediniospores sometimes forming within telia; 21-26 (-29) x 19-23 µm, broadly ellipsoidal to ovoid, the wall 1.5-2 µm thick, hyaline to pale yellow, echinulate (sometimes inconspicuously so), with 2-3 poorly defined germ pores.
Telia 0.5-1 mm diam., usually hypogenous, also on petioles in elongate clusters, chocolate brown. Teliospores 24-34 (-40) x (13-) 17-21 µm, very irregular in shape, often angular, the apex sometimes with a germ pore, often papillate, aseptate, mid brown, smooth, the wall 2-3 µm thick, with a deciduous hyaline pedicel 4-5 µm diam.
Not formally assessed, but the species is common and widespread and very unlikely to be threatened.
On living leaves and petioles of Ficaria verna (syn. Ranunculus ficaria).
Throughout the British Isles.