Urocystis nivalis on Ranunculus acris aggr. (C-F-102479). A Habit (black arrows show sori) B, C spore balls in LM D–F spore balls in SEM G distribution map (red circle – on Ranunculus acris aggr.; yellow circle – on R. nivalis). Scale bars: 0.5 cm (A); 10 µm (B, C); 5 µm (D–F); 500 km (G).