Table 2. Diagnostic characters of Hypoxylon rubiginosum sensu stricto and closely related species. TaxonStromatal shapeStromatal surfaceKOH-extractable pigmentsAscospores (µm)Germ slitHostKnown distributionAnamorphSecondary metabolites*Hypoxylon canarienseeffused to effused-pulvinateFulvous, Dark Brick, Dark VinaceousOrange to Sienna9.5-11.5 × 4.5-5straightErica, Ocotea, Laurus, PerseaSpain (Canary Islands)virgariella-likeRubiginosins A-C, mitorubrinol acetateHypoxylon carneumEffused-pulvinateDark purple, Dark vinaceousLivid violet, absent in old stromata(7.5-)8-11.5 × 4.5-5straightVarious angiosperm hosts including Fraxinusprobably cosmopolitan but raresporothrix-likeCarneic acids A and B, BNTHypoxylon cercidicoladiscoidDark brick to SepiaOrange(9-)9.5-12 × 5-6straight to slightly sigmoidFraxinusEurope and North AmericaunknownMitorubrin, rubiginosin A and CHypoxylon guilanensehemispherical to pulvinateSienna, Umber to BuffOrange12-15 × 5-6straightQuercusIranunknownRubiginosin A, mitorubrinol acetateHypoxylon lusitanicumeffusedBrown VinaceousSienna11-13.5 × 5-7straightRhamnusPortugalunknownRubiginosins A and C, rutilin AHypoxylon petriniaeirregularly effusedLilac, Vinaceous to Brown VinaceousOrange to Rust8-11.5(-13) × 4.8-6straightFraxinus (mostly); Acer, SalicaceaeWestern and Central Europevirgariella-likeRubiginosin A, BNTHypoxylon retpelaeffused-pulvinateLivid Vinaceous, Brown Vinaceous,Orange or Scarlet(9-)9.5-12 × 4.5-5straight or slightly sigmoidunknownSoutheast and East Asia, New Guineanodulisporium-likeMitorubrinol acetate, unknown rubiginosinsHypoxylon rubiginosumeffused-pulvinateDark Brick, Brown VinaceousOrange9-13 × 4-5.5straightVarious angiosperm hosts including FraxinusEurope, North Americanodulisporium-likeMitorubrin, rubiginosin A-C, rubiginosic acid, daldinin CHypoxylon aff. rubiginosum (GUM 1587)pulvinate to effused-pulvinateLuteous, Orange to OchraceousOrange8-10 (-11) × (3-) 4-4.5 (-5)straight to slightly sigmoidQuercusIranvirgariella-likelike H. rubiginosumHypoxylon aff. rubiginosum (GUM 1588)pulvinateOrange to ApricotOrange10-15 × 5-6.5straight to slightly sigmoidunknownIrannot observed-like H. rubiginosumHypoxylon salicicolaeffusedDark rust to Sepia, Brown VinaceousFulvous to Rust7.2-9.6 × 3-4.2straightSalix, rarely on Fraxinus and PrunusNorthern Europe, USAnodulisporium-likeMitorubrinol acetateHypoxylon texenseeffused to effused-pulvinateLivid Vinaceous to Brown VinaceousRust to Dark Brick9.1-10.8(-11.5) × (4.0-)4.5-5.4(-5.7)straight or slightly sigmoidunknownUSAnodulisporium to virgariella-likeRubiginosin A, mitorubrinol acetate, unknown rubiginosinsHypoxylon urriesiieffusedDark BrickOrange11-14.5 × 5-6straight or slightly sigmoidunknownSpain (Canary Islands)unknownMitorubrinol acetate, rubiginosin A

Published as part of Pourmoghaddam, Mohammad Javad, Lambert, Christopher, Surup, Frank, Khodaparast, Seyed Akbar, Krisai-Greilhuber, Irmgard, Voglmayr, Hermann & Stadler, Marc, 2020, Discovery of a new species of the Hypoxylon rubiginosum complex from Iran and antagonistic activities of Hypoxylon spp. against the Ash Dieback pathogen, Hymenoscyphus fraxineus, in dual culture, pp. 105 in MycoKeys 66 on page 105, DOI: 10.3897/mycokeys.66.50946