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<p>The type species of the genus <i>Peltigeromyces</i>, <i>P. microsporus</i>, is redescribed on the basis of the two previously known collections, the holotype from Brazil described by A. Möller and a collection from Bolivia examined by R.W.G. Dennis, both from rotten angiosperm wood in subtropical forests. A morphologically very similar species, <i>P. goossensiae</i>, was described by M. Le Gal based on a collection on unidentified wood in tropical central Africa. It is redescribed here from the holotype and phenetically confirmed as distinct from <i>P. microsporus</i>. Another very similar but European species, <i>P. mollisioides</i>, is newly described. It was earlier reported under the name <i>Parthenope pilatii</i> and is known from numerous collections on rotten wood or sometimes bark of different angiosperms, predominantly <i>Fagus</i>, in temperate to submediterranean forests of central and southern Europe. An emended generic description of <i>Peltigeromyces</i> is given, based on the observed characteristics of the three accepted species. Apothecia of <i>Peltigeromyces</i> resemble an oversized member of <i>Mollisiaceae</i> or <i>Ploettnerulaceae</i>, whereas a resemblance with the lichen genus <i>Peltigera</i> is merely superficial. The ectal excipulum of brown angular cells fits both families, whereas the absence of refractive vacuolar bodies in the paraphyses would forbid placement in <i>Mollisiaceae</i>. <i>Myrioconium-</i>like sporodochia are associated with the apothecia, and their genetic connection was confirmed by rDNA comparison. Their phialides lacking collarettes and the presence of a black stroma extending over the substrate surface below the apothecia are unusual characteristics in both families. Both stroma and sporodochial anamorph are reminiscent of <i>Sclerotiniaceae</i>, but a dark brown excipular cell wall pigment is unknown in that family, and the minute ascus apical ring resembles the <i>Calycina</i>- rather than the <i>Sclerotinia</i>-type. In two previously published combined 5-gene analyses of a Belgian collection of <i>P. mollisioides</i>, the genus <i>Peltigeromyces</i> formed with <i>Drepanopezizaceae</i> and <i>Ploettnerulaceae</i> a supported clade, though on a long branch. This clade represented together with <i>Mollisiaceae</i> and <i>Vibrisseaceae</i> the 'mollisioid clade' of the <i>Helotiales</i>. This distant placement of <i>P. mollisioides</i> close to <i>Drepanopezizaceae</i> and <i>Ploettnerulaceae</i> was confirmed by our combined ITS + LSU analysis which included two newly generated sequences from ana- and teleomorph of a Polish collection of <i>P. mollisioides</i>. For both morphological and phylogenetic reasons, the new family <i>Peltigeromycetaceae</i> is proposed.</p>

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Peltigeromyces mollisioides sp. nov. (Peltigeromycetaceae fam. nov., Helotiales), the correct name for Parthenope pilatii s. auct., with a revision of the type species P. microsporus and P. goossensiae

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Hans-Otto Baral,
  • Ibai Olariaga,
  • Neven Matočec,
  • Ivana Kušan

摘要

The type species of the genus Peltigeromyces, P. microsporus, is redescribed on the basis of the two previously known collections, the holotype from Brazil described by A. Möller and a collection from Bolivia examined by R.W.G. Dennis, both from rotten angiosperm wood in subtropical forests. A morphologically very similar species, P. goossensiae, was described by M. Le Gal based on a collection on unidentified wood in tropical central Africa. It is redescribed here from the holotype and phenetically confirmed as distinct from P. microsporus. Another very similar but European species, P. mollisioides, is newly described. It was earlier reported under the name Parthenope pilatii and is known from numerous collections on rotten wood or sometimes bark of different angiosperms, predominantly Fagus, in temperate to submediterranean forests of central and southern Europe. An emended generic description of Peltigeromyces is given, based on the observed characteristics of the three accepted species. Apothecia of Peltigeromyces resemble an oversized member of Mollisiaceae or Ploettnerulaceae, whereas a resemblance with the lichen genus Peltigera is merely superficial. The ectal excipulum of brown angular cells fits both families, whereas the absence of refractive vacuolar bodies in the paraphyses would forbid placement in Mollisiaceae. Myrioconium-like sporodochia are associated with the apothecia, and their genetic connection was confirmed by rDNA comparison. Their phialides lacking collarettes and the presence of a black stroma extending over the substrate surface below the apothecia are unusual characteristics in both families. Both stroma and sporodochial anamorph are reminiscent of Sclerotiniaceae, but a dark brown excipular cell wall pigment is unknown in that family, and the minute ascus apical ring resembles the Calycina- rather than the Sclerotinia-type. In two previously published combined 5-gene analyses of a Belgian collection of P. mollisioides, the genus Peltigeromyces formed with Drepanopezizaceae and Ploettnerulaceae a supported clade, though on a long branch. This clade represented together with Mollisiaceae and Vibrisseaceae the 'mollisioid clade' of the Helotiales. This distant placement of P. mollisioides close to Drepanopezizaceae and Ploettnerulaceae was confirmed by our combined ITS + LSU analysis which included two newly generated sequences from ana- and teleomorph of a Polish collection of P. mollisioides. For both morphological and phylogenetic reasons, the new family Peltigeromycetaceae is proposed.