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<p>This study describes three new species of <i>Geastrum</i> — <i>G. iguassuense</i>, <i>G. nodimyceliale</i>, and <i>G. unisaccatum</i> — based on morphological and molecular data from specimens previously identified as <i>G. saccatum</i> in the herbarium collection of the Institute of Natural Sciences – UFRGS. Morphological characterization involved macroscopic and microscopic features, including optical microscopy and scanning electron microscopy. Molecular data were obtained from the ITS and LSU regions of nuclear ribosomal DNA. Phylogenetic relationships were inferred using Bayesian and maximum likelihood inference methods. The results support the inclusion of the three proposed new species in the <i>Corollina</i> section of the genus <i>Geastrum</i>, revealing them to be well-founded and distinct evolutionary lineages. These findings highlight the underestimated diversity of <i>Geastrum</i> in the Neotropics and the taxonomic relevance of integrating molecular and morphological data. With the addition of the three new species, the <i>Corollina</i> section now comprises seventeen recognized species. Detailed descriptions, comparisons with morphologically similar species, illustrations, and an updated identification key for the <i>Corollina</i> section are provided.</p>

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Taxonomic and phylogenetic studies reveal three new species of the genus Geastrum in the Corollina section from Brazil

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月7日

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  • Ruane Vasconcelos Bento de Araújo,
  • Marcelo Araújo Silva,
  • Tiara Sousa Cabral,
  • Iuri Goulart Baseia,
  • Alessandra Selbach Schnadelbach,
  • Bianca Denise Barbosa da Silva

摘要

This study describes three new species of Geastrum — G. iguassuense, G. nodimyceliale, and G. unisaccatum — based on morphological and molecular data from specimens previously identified as G. saccatum in the herbarium collection of the Institute of Natural Sciences – UFRGS. Morphological characterization involved macroscopic and microscopic features, including optical microscopy and scanning electron microscopy. Molecular data were obtained from the ITS and LSU regions of nuclear ribosomal DNA. Phylogenetic relationships were inferred using Bayesian and maximum likelihood inference methods. The results support the inclusion of the three proposed new species in the Corollina section of the genus Geastrum, revealing them to be well-founded and distinct evolutionary lineages. These findings highlight the underestimated diversity of Geastrum in the Neotropics and the taxonomic relevance of integrating molecular and morphological data. With the addition of the three new species, the Corollina section now comprises seventeen recognized species. Detailed descriptions, comparisons with morphologically similar species, illustrations, and an updated identification key for the Corollina section are provided.