Key to Danish species of Oligonema Rostaf.
|1||Spores finely warted. Elaters short with an indistict spiral ornamentation thickened apices. Spherical sporocarps.||O. fulvum Morgan|
|1'||Spores win a net-ornamentation. Elaters with indistict warts or spiral bands.||2|
|2 (1)||Sporocarps ± spherical, closely aggregated and often superimposed. Elaters with a faint spiral ornamentation.||O. schweinitzii (Berk.) G.W. Martin|
|2'||Sporocarps higher than wide, in close groups but not superimposed. Elaters mostly with very fine, irregular warts.||O. flavidum (Peck) Peck|