Key to Danish species of Trichia Haller

1 Elaters with one or two spiral bands, which often are more prominent on one side. T. varia (Pers. ex J.F. Gmel.) Pers.
1' Elaters with three or more spiral bands. 2
2   (1) Sessile sporocarps. 3
2' Sporocarps stipitate. 8
3   (2 ) Spores warted. Sporocarps ± free. 4
3' Spores with a net ornamentation. Sporocarps closely crowded. 5
4   (3) Sporocarps reddish brown to yellowish brown, occasionally with lighter veins. Peridium robust, with granular matter embedded. T. contorta (Ditmar) Rostaf.
4' Sporocarps bright yellow to olivaceous yellow. Peridium thin, membranaceous and shining, devoid of embedded matter. T. lutescens (Lister) Lister
5   (3) Spores with a fine-meshed net-ornamentation with uniformly sized meshes, bright orange to yellowish orange when freshly matured. T. scabra Rostaf.
5' Spores with a wide-meshed net-ornamentation, the meshes themselves formed by rows of fine meshes, yellow, orange or ochraceous. 6
6   (5) Sporocarps higher than wide. Elaters 6-8 µm broad, smooth. T. favoginea (Batsch) Pers. s.str.
6' Sporocarps ± spherical. Elaters 4-6 µm broad. 7
7   (6) Elaters with spinulose spiral bands. Spores ochraceous, net-ornamentation often irregular, occasionally with broad groups of small meshes. T. persimilis P. Karst.
7' Elaters with smooth sparal bands or with only few small spines. Spores bright yellow, net-ornamentation mostly rather complete, ocasionally with meshes formed from simple ridges (not rows of small meshes). T. affinis de Bary
8   (2) Spores with a net-ornamentation. 9
8' Spores warted or almost smooth. 10
9   (8) Sporocarps yellow, often several sporocysts on a common stalk. Spore net-ornamentattion formed by rows of small meshes. Elaters with short tapered ends. T. verrucosa Berk.
9' Sporocarps dull yellowish, with a brownish-olivaceous tint; dehiscing irregulaly. Spore net-ornamentation formed by elongated warts or short ridges, often fragmentary. Elaters with long tapered ends. T. decipiens (Pers.) T. Macbr.
10   (8) Sporocarps ochraceous, olivaceous or dull brownish. Stalk filled with spore-like cells. Spores often with an incomplete net formed by elongated warts or almost smooth. 11
10' Sporocarps brown to purple brown, mostly with yellowish veins. Stalk filled with amorphous material. (If spores brick-red to rust-red and stalk translucent: see Metatrichia floriformis). 12
11   (10) Sporocarps olivaceous with an ± distinct lid. Spores with comma-shaped warts, often ± coalesced, but not forming a net. On rotten wood or plant debris. T. crateriformis G.W. Martin
(syn.: T. decipiens var. olivacea (Meyl.) Meyl.)
11' Sporocarps dull greyish brown to olivaceous brown. Spores almost smooth or with scattered fine warts. Always on dung of herbivores. T. brunnea J.J. Cox
12   (10) Spores 9-10 µm in diam. Elaters with 80-100 µm long tapered ends. Sporocarps dark brown to purplish brown with yellowish veins forming a net of 2-3 meshes across a diam. T. botrytis (J. F. Gmel.) Pers.
12' Spores 10-12 µm in diam. Elaters with at most 40-50 µm long tapered ends. Sporocarps yellowish brown with yellowish veins forming a net of 5-8 meshes across a diam. Trichia ambigua Schirmer, L.G. Krieglst. & Flatau)