This dataset contains 6000 photographs of myxomycetes of the genus Lycogala, including field shots of early developmental stages, macrophotographs of sporocarps and details of their surface, microscopy of the peridium, capillitium, and spores, as well as SEM microscopy of these structures. The photographs are sorted by morphological species, including currently undescribed ones. If a morphological species includes several ribogroups (putative biospecies), they form subfolders within folders. Each photograph is labeled with the herbarium specimen number and ribogroup number. More detailed data about the samples, including their molecular barcodes, are available in the appendices to the article "Expanding Lycogala: twenty four new species, their morphology and phylogenetic relationships."