Key to Danish species of Fuligo Haller

1 Spores 6-9 µm in diam. Aethalia cushion-shaped, ca. 2-20 cm in diam. 2
1' Spores 10-13 µm in diam. Aethalia irregularly cushion-shaped, up to ca. 1 cm in diam. F. muscorum Alb. & Schwein.
2   (1) Aethalia red-brown to purple brown. The aethalial wall thick, almost smooth. Spores 6-7 µm in diam. F. leviderma H. Neubert, Nowotny & K. Baumann
2' Aethalia white, greyish, pale rose to lemon-yellow. The aethalial wall with an irreular, foam-like surface. Spores 7-9 µm in diam. F. septica (L.) F.H. Wigg.