SUMMARY
The genus Diacheopsis is characterized by noncolumellate, sessile fructifications which lack lime and contain brown spores. The four existing species are regarded as valid, and two new species, D. effusa and D. serpula, are described. Three of the species, D. effusa, D. metallica and D. serpula, are snowline myxomycetes, and three, D. depressa, D. insessa and D. pieninica, are basically lowland in distribution. A key to the species and detailed descriptions are included.