Anthracoidea heterospora on Carex nigra (leg. C.A. Jørgensen, s.n., C-Greenland herb., s.n.). A Habit B, C spores in LM, in median and surface view, respectively D–F spores in SEM G distribution map (red circle – on Carex nigra; yellow circle – on a hybrid of C. bigelowii). Scale bars: 0.5 cm (A); 10 µm (B, C); 5 µm (D–F); 500 km (G).