VOLUME 2 DECEMBER 2018 Fungal Systematics and Evolution PAGES 311–340 doi.org/10.3114/fuse.2018.02.09 A preliminary overview of the corticioidAtractiellomycetes (Pucciniomycotina, Basidiomycetes) V. Spirin1,2,*, V. Malysheva3, G. Trichies4, A. Savchenko5, K. Põldmaa5, J. Nordén6, O. Miettinen1, K.-H. Larsson2 1Botany Unit (Mycology), Finnish Museum of Natural History, P.O. Box 7, FI-00014 University of Helsinki, Finland 2Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, 0318 Oslo, Norway 3Komarov Botanical Institute, Russian Academy of Sciences, Prof. Popova str. 2, 197376 St. Petersburg, Russia 45, Empasse des Écoles, F-57700 Neufchef, France 5Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, EE-51005 Tartu, Estonia 6Norwegian Institute for Nature Research, Gaustadalléen 21, 0349 Oslo, Norway *Corresponding author:
[email protected] Key words: Abstract: The taxonomy of the corticioid fungi from the class Atractiellomycetes (Pucciniomycotina, Basidiomycetes) corticioid species currently addressed to the genus Helicogloea, is revised based on morphological and nuclear ribosomal DNA (ITS and LSU) phylogeny data. The genus is restricted to 25 species with semitranslucent, gelatinous basidiocarps lacking differentiated cystidia and rust fungi clamps on hyphae, of which 11 are described as new to science. The asexual genus Leucogloea is placed as a synonym of taxonomy Helicogloea s. str. Since the type species of Saccoblastia, S. ovispora, is combined to Helicogloea, a new genus, Saccosoma, is introduced to encompass Saccoblastia farinacea and six related species, one of which is described as new. In contrast to Helicogloea in the strict sense, the basidiocarps of Saccosoma are arid, not gelatinized, and hyphae are clamped.