Abstract
Cyanosporus is a cosmopolitan brown-rot fungal genus, recognizable by blue-tinted basidiocarps. Species in this genus were usually treated as belonging to the Postia caesia complex, however, recent phylogenetic analyses showed that this complex represents an independent genus. During further studies on Cyanosporus, five new species were discovered based on morphological features and molecular data. Phylogenetic analyses of Cyanosporus were conducted using the internal transcribed spacer (ITS) regions, the large subunit of nuclear ribosomal RNA gene (nLSU), the small subunit of nuclear ribosomal RNA gene (nSSU), the small subunit of mitochondrial rRNA gene (mtSSU), the largest subunit of RNA polymerase II (RPB1), the second largest subunit of RNA polymerase II (RPB2), and the translation elongation factor 1-α gene (TEF); illustrated descriptions of the new species are provided. In addition, fifteen species previously belonging to the Postia caesia complex are transferred to Cyanosporus and proposed as new combinations.
Highlights
Boletus caesius Schrad. was described based on material from Germany (Schrader, 1794), and this name was subsequently sanctioned by Fries (1821), who considered B. coeruleus Schumach. a synonym of Polyporus caesius (Schrad.) Fr
The internal transcribed spacer (ITS) + translation elongation factor 1-α gene (TEF) sequences dataset had an aligned length of 1166 characters, of which 646 characters were constant, 68 were variable and parsimony-uninformative, and 452 were parsimonyinformative
The combined three-gene (ITS + nLSU + TEF) sequences dataset had an aligned length of 2475 characters, of which 1752
Summary
Boletus caesius Schrad. was described based on material from Germany (Schrader, 1794), and this name was subsequently sanctioned by Fries (1821), who considered B. coeruleus Schumach. a synonym of Polyporus caesius (Schrad.) Fr. A synonym of Polyporus caesius (Schrad.) Fr. In 1881 Karsten transferred Boletus caesius to Postia Fr. as Postia caesia (Schrad.) P. Murrill (1907) transferred this species to Tyromyces P. As T. caesius (Schrad.) Murrill and later McGinty (1909) proposed a new monotypic genus Cyanosporus McGinty for Polyporus caesius, based on its cyanophilous basidiospores, but Cyanosporus caesius was not widely used in subsequent studies (Donk, 1960; Jahn, 1963; Lowe, 1975), while Tyromyces caesius was commonly used. Postia caesia was widely used (Papp, 2014). David (1974, 1980) described another two species: P. luteocaesia David) Jülich from Europe besides Postia caesia (Schrad.) P. Pieri and Rivoire (2005) introduced the fifth European species, P. mediterraneocaesia
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