title: Sutorius: a new genus for Boletus eximius.
abstract: Sutorius is described as a new genus of Boletaceae to accommodate Boletus robustus originally named illegitimately by C.C. Frost from eastern North America. The legitimate name, Boletus eximius, provided by C.H. Peck, has been used since for a dark purple to chocolate brown bolete with finely scaly stipe and reddish brown spore deposit. This iconic taxon has been documented on five continents. Despite the straightforward species identification from morphology, the interpretation of stipe macro-morphology and spore color has led to equivocal generic placement. Phylogenetic analyses of genes encoding large subunit rRNA and translation elongation factor 1α confirm Sutorius as a unique generic lineage in the Boletaceae. Two species are recognized based on multiple accessions: S. eximius, represented by collections from North America, Costa Rica, Guyana, Indonesia and Japan (molecular data are lacking for only the Guyanan and Japanese material); and S. australiensis, represented by material from Queensland, Australia. Additional collections from Zambia and Thailand represent independent lineages, but sampling is insufficient to describe new species for these entities.
authors.affiliation: Institute of Systematic Botany, The New York Botanical Garden, Bronx, NY 10458-5126, USA. rhalling@nybg.org
authors.forename: Roy E
authors.initials: RE
authors.lastname: Halling
authors.forename: Mitchell
authors.initials: M
authors.lastname: Nuhn
authors.forename: Nigel A
authors.initials: NA
authors.lastname: Fechner
authors.forename: Todd W
authors.initials: TW
authors.lastname: Osmundson
authors.forename: Kasem
authors.initials: K
authors.lastname: Soytong
authors.forename: David
authors.initials: D
authors.lastname: Arora
authors.forename: David S
authors.initials: DS
authors.lastname: Hibbett
authors.forename: Manfred
authors.initials: M
authors.lastname: Binder
mesh_terms: D001487:Basidiomycota / Q000145:classification* / Q000166:cytology / Q000235:genetics / Q000378:metabolism; D003116:Color; D004271:DNA, Fungal / Q000235:genetics*; D017753:Ecosystem; D020459:Genes, rRNA; D016533:Mycological Typing Techniques; D020648:Peptide Elongation Factor 1 / Q000235:genetics; D010802:Phylogeny; D058974:Phylogeography; D010860:Pigments, Biological / Q000378:metabolism; D054683:Ribosome Subunits, Large, Eukaryotic / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D014197:Trees / Q000382:microbiology
chemical_list: D004271:DNA, Fungal; D020648:Peptide Elongation Factor 1; D010860:Pigments, Biological