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New Trypetheliaceae from northern and southern Atlantic rainforests in Brazil

  • André APTROOT (a1), Cléverton de Oliveira MENDONÇA (a2), Danyelly Santos ANDRADE (a3), Jeanne dos Reis SILVA (a3), Suzana Maria de Azevedo MARTINS (a4), Emerson GUMBOSKI (a5), Carlos Augusto Vidigal FRAGA (a6) and Marcela Eugenia da Silva CÁCERES (a3)...

Abstract

The following 16 new species of Trypetheliaceae are described from Brazil: Astrothelium aeneoides Aptroot, differing from A. aeneum by the absence of pigment on the thallus, but medulla of pseudostroma K+ blood red and ascospores 3-septate, lumina diamond-shaped; A. curvatum Aptroot & M. Cáceres with immersed pyriform ascomata with lateral ostioles and bent, muriform ascospores, 74–90×25–34 μm; A. globosum Aptroot & M. Cáceres with immersed ascomata, thallus consisting of nearly globose warts and ascospores 3-septate, 35–40×11–13 μm; A. graphicum Aptroot & S. M. A. Martins with an extended, reticulate pseudostroma, which is lower than the slightly bullate thallus, orange pruina on the thallus and pseudostroma and ascospores muriform, 60–66×12–16 µm; A. longisporum Aptroot, J. R. Silva & M. Cáceres, which differs from A. megaspermum by the eccentric ostioles and the 8 instead of 4 ascospores per ascus; A. macrostomum Aptroot which is similar to A. eustomum (Mont.) Müll. Arg., but differing by the 5–7-septate ascospores 65–85×16–19 μm.; A. megeustomum Aptroot & Fraga Júnior which is similar to Astrothelium eustomum, but with muriform ascospores 117–125×17–21 μm; A. pictum Aptroot with 5-septate ascospores, red crystals in the pseudostroma medulla and lichexanthone in the thallus; A. rubrocrystallinum Aptroot & M. Cáceres which is similar to A. annulare, but with copious red crystals in a thick layer around the ascomata and ascospores 22–27×7–9 μm; A. simplex Aptroot & S. M. A. Martins with 3-septate ascospores and a very rough thallus, differing from A. sinuosum by the lack of lichexanthone; A. sinuosum Aptroot & Gumboski with an ostiolar UV+ yellow reaction, bullate thallus and a wavy gelatinous sheath around the ascospores; A. tetrasporum Aptroot & M. Cáceres which is similar to A. puiggarii, but differs by the non-inspersed hamathecium and the ascus that contains only 4 ascospores; Polymeridium endoflavens Aptroot, D. S. Andrade & M. Cáceres with yellow oil inspersion in the hamathecium and 5–7-septate ascospores 32–37×10–13 μm; P. longiflavens Aptroot, Mendonça & M. Cáceres with yellow oil inspersion in the hamathecium, an apical ostiole and 9–11-septate ascospores 57–70×12–14 μm; Trypethelium luteolucidum Aptroot, Mendonça & M. Cáceres which is similar to T. regnellii, but differs by the presence of anthraquinone crystals in the pseudostromata; and Viridothelium leptoseptatum Aptroot & M. Cáceres, resembling Astrothelium aeneum but with no pigment on the thallus, a thin to absent thallus cover on the ascomata and thin-walled, constricted ascospores with lumina of a similar shape to the ascospore cell walls. Most are known only from Brazil, but a few are also known from Mexico, Puerto Rico, and/or Guyana. North-eastern Brazil is the centre of diversity of the genus Polymeridium, with 33 species now known.

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References

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Aptroot, A. & Cáceres, M. E. S. (2016) New Trypetheliaceae from the Amazon basin in Rondônia (Brazil), the centre of diversity of the genus Astrothelium . Lichenologist 48: 693712.
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The Lichenologist
  • ISSN: 0024-2829
  • EISSN: 1096-1135
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