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Key to Danish Genera of Myxomycetes The key has been revised until october 1995.
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| 1 | Spores formed on thin stalks on the outside of the fruitbody. Sporocarps of branched columns, occasionally coaleshed into honeycomb like cushions. Mostly white, occasinally cream or pale yellowish. | Ceratiomyxa |
| 1' | Spores formed inside the fruitbody, covered by a peridium which may have disintegrated at maturity. Formed i great numbers. Mostly pigmented. | 2 |
| 2 (1) | Spores dark brown or purplish brow to black. | 3 |
| 2' | Spores whitish, yellowish, reddish, cinnamon to rust brown or with olive to greenish tint. | 31 |
| 3 (2) | Fruitboby an aethalium or a psuedoaethalium of closely standing sporocarps coaleshed at the bases. | 4 |
| 3' | Fruitbody a sporocarp, sessile or stipitate, or a plasmodiocarp. | 8 |
| 4 (3) | Lime present. Fruitbody an aethalium. | 5 |
| 4' | Lime not present. Fruitbody an aethalium or a pseudoaethalium. | 6 |
| 5 (4) | Lime present on the peridium and in the capillitum. Of rounded granules. | Fuligo |
| 5' | Lime present only on the peridium. Of more or less stellate crystals. | Mucilago |
| 6 (4) | Fruitbody a pseudoaethalium. Individual sporocarps clearly discernible. | Symphytocarpus |
| 6' | Fuitbody an aethalium. | 7 |
| 7 (6) | Capillitium of more or less radiating threads with septate vesicles. | Brefeldia |
| 7' | Capillitium a net, without septate vesicles. | Amaurochaete |
| 8 (3) | Lime is present on the peridium and/or in the capillitium and/or in the stalk. | 9 |
| 8' | Lime absent from all parts of the fruitbody (see also 19 Leptoderma). | 16 |
| 9 (8) | Lime present in the capillitium, mostly also on the peridium. | 10 |
| 9' | Lime absent from capillitium, present on the peridium and/or in the stalk. | 13 |
| 10 (9) | Fruitbody a sporocarp with yellowish brown to chestnut brown, smooth and shining peridium; opens irregularly near apex. | Leocarpus |
| 10' | Peridium different or if smooth and brownish then opening by a lid. | 11 |
| 11 (10) | Capillitium a net of lime-filled tubules, rarely also with limeless parts, which are mostly thinner and hyaline; spores free or in clusters. | Badhamia |
| 11' | Capillitium a net of thin, hyaline tubules; lime only present in nodes; spores free. | 12 |
| 12 (11) | Fruitbodies spherical- to cupshaped sporocarps. Apical part developed into a well defined lid. Basal part persistent. Columella absent, but often a large lime-filled pseudocolumella is present. | Craterium |
| 12' | Fruitbodies sporocarps, stipitate or sessile, occasionally in closely appressed pseudoaetlium-like collections, or plasmodiocarps. Open along irregular slits in the peridium, never by a lid. Columella or pseudocolumella often present. | Physarum |
| 13 (9) | Lime present only in the stalk and columella. Peridium iridescent. | Diachea |
| 13' | Lime on the peridium, often also in the columella. | 14 |
| 14 (13) | Lime on the peridium as small, rounded ganules agglutinated into an eggshell-like | Diderma |
| 14' | Lime on the peridium as stellate crystals, most often sprinkled on the surface, rarely agglutinated into a shell or scales with crystalline structure. | 15 |
| 15 (14) | Lime crystals loosely sprinkled on the peridium or agglutinated into a shell. | Didymium |
| 15' | Lime as flattened scales fastened to the peridium. | Lepidoderma |
| 16 (8) | Fruitbody a sessile sporocarp. Columella absent. Peridium persistent. | 17 |
| 16' | Fruitbody a stipitate sporocarp. Columella often present. Peridium persistent, early disintegrating or dissolved into parallel ribs. | 21 |
| 17 (16) | Capillitium present. | 18 |
| 17' | Capillitium absent. | Licea |
| 18 (17) | Peridium membranous, iridescent. | 19 |
| 18' | Peridium gelatinous when moist, horny when dry. | Colloderma |
| 19 (18) | The basal peridial parts thickened and often with embedded crystalline lime. | (Leptoderma) |
| 19' | Peridium uniform membranous without lime embeddings. | 20 |
| 20 (19) | The capillitium a net of hollow, pale tubules. Limeless forms of | Badhamia |
| 20' | Capillitium of dark, solid threads forming an open net. | Diacheopsis |
| 21 (16) | Columella and capillitium absent. The peridium developed into a net of parallel ribs with thin interconnections (Dictydium) | Cribraria |
| 21' | Columella and capillitium present. The peridium membranous or early evanescent. | 22 |
| 22 (21) | The stalk contains wax, often as a collar below the sporocarp. | (Elaomyxa) |
| 22' | Stalk devoid of wax. | 23 |
| 23 (22) | Stalk translucent, hollow (often with air bubbles in slides in water). | 24 |
| 23' | Stalk not translucent, ± fibrous. | 25 |
| 24 (23) | Sporocarps cylindric, often closely appressed but not coalesced. With a surface net fastened to the capillitium. Peridium early evanescent. | Stemonitis |
| 24' | Sporocarps spherical, scattered. Without a surface net. Peridium often leaving a collar around the stalk. Small species. | (Macbrideola) |
| 25 (23) | Peridium persistent. Sporocarps spherical to pear-shaped. | 26 |
| 25' | Peridium early evanescent or if persistent, then the sporocarp distinctly cylindrical. | 28 |
| 26 (25) | The peridium splits into plates adhering to the tips the capillitium which is dichotomously branched. Columella short or absent. | (Clastoderma) |
| 26' | Peridium different. The capillitium arises from the top of the cylindrical columella. | 27 |
| 27 (26) | The peridium splits irregularly at maturity. The capillitium mostly intricately branched to net-shaped. | Lamproderma |
| 27' | The capillitium splits into 5-9 lobes, with granular material embedded in the apical part. Capillitium of 7-10 sparsely branched threads. Tiny species. | (Barbeyella) |
| 28 (25) | The columella reaches the apex of the sporocarp where it expands into a disc giving rise to the capillitium. | Enerthenema |
| 28' | Columella not disc-shaped expanded at apex. | 29 |
| 29 (28) | Capillitium branched, mostly dichotomous, without anastomoses, the branches tapered or club-shaped thickened (Comatricha p. p.) | Paradiacheopsis |
| 29' | Capillitium net-shaped. | 30 |
| 30 (29) | The sporocarps ± cylindrical. Stalk shorter than the sporocarp. The capillitium often with plate-shaped expansions at the nodes (Comatricha p. p.). | Stemonitopsis |
| 30' | The sporocarps spherical to cylindrical. The stalk as long as or mostly several times the length of the sporocarp. Rarely with plate-shaped expansions in the capillitium. | Comatricha |
| 31 (2) | The spores whitish or pinkish. Fruitbody a very small, spherical, stipitate sporocarp. | Echinostelium |
| 31' | Spores more colourful. Fruitbody of different shapes. | 32 |
| 32 (31) | Capillitium or pseudocapillitium present. | 33 |
| 32' | Capillitium or pseudocapillitium absent. | 50 |
| 33 (32) | Fruitbody a more or less spherical- to cushion-shaped aethalium or a cushion-shaped to flattened pseudoaethalium (individual sporocarps visible ± clearly). Pseudocapillitium, occasionally sparse. | 34 |
| 33' | Fruitbody a sessile or stipitate sporocarp or a plasmodiocarp. True capillitium present. | 37 |
| 34 (33) | Fruitbody a spherical- to cushion-shaped aethalium. | 35 |
| 34' | Fruitbody a cushion-shaped to flattened pseudoaethalium. | 36 |
| 35 (34) | Spores greyish rose, fading to greyish ochraceous. Aethalium spherical- to rounded conical or flattened drop-shaped. Pseudocapillitium of branched tubules. | Lycogala |
| 35' | The spores cinnamon to ochraceous. Aethalium cushion-shaped. Pseudoaethalium of branched threads or perforated plates, never tubular. | Reticularia |
| 36 (34) | The pseudoaethalium ± cushion-shaped, individual sporocarps partly free, the shared peridial walls partly persistent, honeycomb-shaped. Spores rusty brown to cinnamon. | Tubifera |
| 36' | Pseudoaethalium flattened, individual sporocarps visible as hexagonal fields on the surface. Spores clay-coloured to olive. | Dictydiaethalium |
| 37 (33) | Columella present. Brown to dark brown, stipitate sporocarps. | 38 |
| 37' | Columella absent. Sporocarps or plasmodiocarps, mostly in yellowish or reddish colours, but greyish to brownish sporocarps may occur. | 39 |
| 38 (37) | Sporocarps cylindrical, mostly closely appressed or more or less fasciculate, but not coaleshed. Surfacenet present. | Stemonitis |
| 38' | Sporocarps spherical, more or less spherical to shot cylindrical. Surface net absent. | Comatricha |
| 39 (37) | Capillitium of solid threads, not net-shaped. | 40 |
| 39' | Capillitium of tubules (occasionally the cavity is visible only near the base), unbranched or net-shaped or fastened on the peridium and at the base of the sporocarp. | 42 |
| 40 (39) | Capillitial threads with regular distributed thickenings. Spores dark olivaceous. Small sessile sporocarps on Cladonia-thalli. | Listerella |
| 40' | Capillitial threads smooth to irregularly warted. Spores greyish olivaceous or greyis rose. Fruitbodies flattened plasmodiocarps or sessile sporocarps, often with shining peridium. | 41 |
| 41 (40) | Capillitial threads more or less straight, branched or in small fascicles; mostly fastened to the peridium. | Dianema |
| 41' | Capillitial threads long and flexuose, unbranched or sparsely branched, mostely free. | Calomyxa |
| 42 (39) | Capillitial tubules with distinct spiral ornamentation. | 43 |
| 42' | Capillitial tubules with spines, warts, ring- or halfring-shaped thickenings or bands, rarely almost smooth or with indistinct and irregular spiral bands. | 46 |
| 43 (42) | Capillitial tubules unbranched, free and tapered in both ends or branched without anastomoses and fastened at the base and on the peridium. | 44 |
| 43' | Capillitium net-shaped, often expanding at maturity. | 45 |
| 44 (43) | Capillitial tubules free, tapered in both ends. Sessile or stipitate sporocarps or short plasmodiocarps. | Trichia |
| 44' | Capillitial tubules fastened in both ends, apparently composed of rope-like twisted threads, lumen mostly indistinct. | Prototrichia |
| 45 (43) | Fruitbodies fasciculate sporocarps. Peridium robust, opening by a lid. Capillitium spinulose, expanding, brick red. | Metatrichia |
| 45' | Fruitbody a sporocarp or a plasmodiocarp. Peridium membranaceous, opening irregularly, without a lid. | Hemitrichia |
| 46 (42) | Capillitium net-shaped. | 47 |
| 46' | Capillitium of unbranched or sparsely branched tubules, not net-shaped. | 49 |
| 47 (46) | Apical peridial parts early evanescent, basal parts persistent as a well defined conical cup. | Arcyria |
| 47' | Perisium persistent, opening irregularly, no basal cup. | 48 |
| 48 (47) | Sporocarps spherical, sessile in close clusters. Capillitium with warts or spines. Spores rose-coloured. | Arcyodes |
| 48' | Fruitbody varying from sessile sporocarps to plasmodiocarps. Capillitial tubules with groups of ring-shaped thickenings. Spores yellow. | Cornuvia |
| 49 (46) | Capillital tubules long, with warts or spines. Scattered sporocarps or plasmodiocarps. | Perichaena |
| 49' | Capillitial tubules short, smooth or with a faint, irregular spiral ornamentation. Sporocarps scattered or in close clusters. | Oligonema |
| 50 (32) | Sporocarps, rarely coaleshing to a pseudoaethalium or an aethalium. Dictydine granules present. Spores mostly in vivid colours, if dark then fruitbody always a sporocarp. | 51 |
| 50' | Fruitbody a small sporocarp or a plsmodiocarp. Dictydine granules absent. Spores greyish olivaceous to smoky, often fairly dark. | Licea |
| 51 (50) | Fruitbody a sporocarp, mostly distinctly stipitate. The peridium or parts of the peridium evanescent leaving a surface net of varying shape (incl.Dictydium). | Cribraria |
| 51' | Fruitbody a pseudoaethalium or an aethalium, rarely a sporocarp. Surface net absent. | Lindbladia |
Last update 13-05-2010