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Geastrum melanocephalum, originally described as Trichaster melanocephalus, is characterized by large basidiomata and an evanescent endoperidium. Although Trichaster was recently treated as a synonym of Geastrum and the specific name G. melanocephalum has often been used, it is still controversial whether Trichaster is an independent genus. Althoug...

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Geastrum tupiense is a new species belonging to subsect. Velutina (Sect. Myceliostroma). The fundamental diagnostic characteristics are reddish immature basidiomata and rhizomorphs with bipyramidal crystals. It was found in two areas of the Atlantic Forest biome, considered one of the main hotspots in the world for its high level of endemism and biodiversity. Delimitation of this new species was based on morphological characters and phylogenetic analyses of ITS/LSU nrDNA. Descriptions, phylogenetic tree, photographs, and taxonomic discussion are provided.