Microbotryum silenes-acaulis on Silene acaulis. A Habit (N. Jacobsen, no. G.B.U. 1717, C-Greenland herb., s.n.) B, C spores in LM, in median and surface view, respectively (H. Andersen & J. Feilberg, no. G.B.U. 4775, C-Greenland herb., s.n.) D–F spores in SEM (D C. Bay et al., no. G.B.U. 78-1571, C-Greenland herb., s.n.; E, F S. Holt, no. 1308, C-Greenland herb., s.n.) G distribution map. Scale bars: 0.5 cm (A); 10 µm (B, C); 5 µm (D–F); 500 km (G).