Key to Danish species of Reticularia Bull.

1 Pseudocapillitium a net of perforated plates or of branching and anastomozing threads; no or only few free ends. 2
1' Pseudocapillitium branched, often tree-like, with many free ends. 4
2   (1) Aethalia flattened to cushion-shaped, dark olive-brown to olive-green. Spores in clusters, spinulose on free surfaces. R. olivacea (Ehrenb.) Fr.
2' Aethalia cushion-shaped or ± spherical and then often in dense groups, rust-brown to reddish orange. Spores free, with a net-ornamentation. 3
3   (2) Aethalia mostly in dense groups, ± spherical, often somewhat angular from mutual pressure, up to ca. 1.5 mm in diam. Spores with wide-meshed net-ornamentation. R. lobata Lister
3' Aethalia cushion-shaped, 2.5-25 mm in diam. Spores with a fine-meshed net covering ca. 2/3 of the surface. R. jurana Meyl.
4   (1) Aethalia ± spherical, up to ca. 1.5 mm in diam., in dense groups. R. lobata Lister
4' Aethalia cushion-shaped, from ca. 0.5 cm up to ca. 10 cm in diam. 5
5   (4) Pseudocapillitium in basal part of flattened plates which branche in a tree-like manner towards the periphery. Peridium in freshly matured specimens rather tough, silvery-grey. R. lycoperdon Bull.
5' Pseudocapillitium of branching, rather thin threads. Peridium thin, colourless, early evanescent. R. intermedia Nann.-Bremek.