4.2 Article

Revision of Dimelaena Norman (Caliciaceae, Ascomycota) species containing usnic acid reveals a new species and a new combination from China

Journal

PHYTOTAXA
Volume 574, Issue 4, Pages 259-272

Publisher

MAGNOLIA PRESS
DOI: 10.11646/phytotaxa.574.4.1

Keywords

lichenized fungi; nuITS-nuLSU-mtSSU; phylogeny; taxonomy

Categories

Funding

  1. Flora Lichenum Sinicorum [2020388]
  2. Youth Innovation Promotion Association CAS [2019QZKK0503]
  3. Second Tibetan Plateau Scientific Expedition and Research Program (STEP) [P2020-KF08]
  4. State Key Laboratory of Phytochemistry and Plant Resources in West China [31970022]
  5. Yunnan Young & Elite Talents Project
  6. National Natural Science Foundation of China
  7. [31750001]

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Dimelaena tibetica is a new species characterized by a grayish yellow surface, usually with a covering of white pruina, a crustose thallus, areolate at center, radiate-plicate at margin, adnate apothecia and lacking gyrophoric acid. It differs from other usnic acid-containing Dimelaena species by its plane marginal lobes and adnate apothecia. Based on the study of fresh specimens from the environment of the type locality, Dimelaena altissima is proposed as a new combination. The phylogenetic position of the genus Dimelaena was confirmed by generating a sequence from a fresh specimen of Dimelaena oreina. All three species share common characters: usnic acid content and a yellowish green upper surface. Descriptions of these species were based on a combination of morphological and phylogenetic analyses. A key and phylogram are provided for these three Dimelaena species which produce usnic acid.
Dimelaena tibetica is described as a species new to science, characterized by a grayish yellow surface, usually with a covering of white pruina, a crustose thallus, areolate at center, radiate-plicate at margin, adnate apothecia and lacking gyrophoric acid. It differs from other usnic acid-containing Dimelaena species by its plane marginal lobes and adnate apothecia. Based on the study of fresh specimens from the environment of the type locality, Dimelaena altissima is proposed as a new combination. A fresh specimen of Dimelaena oreina (type species of the genus Dimelaena) was collected in the Swiss Alps, in the vicinity of the area where the type material of the species presumably was collected, and a sequence was generated to confirm the phylogenetic position of this genus. All three species share common characters: usnic acid content and a yellowish green upper surface. Descriptions of these species were based on a combination of morphological and phylogenetic analyses. A key and phylogram are provided for these three Dimelaena species which produce usnic acid.

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