Chionosphaera apobasidialis is a lichenicolous fungus (it parasitises lichens). It belongs to the subphylum Pucciniomycotina. Phylogenetic results place Chionosphaera in the Agaricostilbomycetidae. Chionosphaera apobasidialis was sequenced as part of the 1000 Fungal Genomes Project.
References
Cox, DE A new homobasidiomycete with anomalous basidia. Mycologia 1976, 68(3):481-510
McLaughlin DJ, Hanson RW Jr, Frieders EM, Swann EC, Szabo LJ. Mitosis in the yeast phase of the basidiomycetes Bensingtonia yuccicola and Stilbum vulgare and its phylogenetic implications. Am J Bot. 2004, 91(6):808-15