Uncontrolled urbanization growth contributes to the pollution of aquatic environments. Heavy metals released by domestic and industrial effluents can negatively affect aquatic organisms. This study aimed to evaluate the effect of environmental pollutants, such as metals, on fish DNA damage, in stretches of an urban stream. Specimens of the Neotropical fish, Astyanax lacustris , were exposed in situ for 96 h along the Antas stream, a Brazilian aquatic system deteriorated by anthropogenic factors. Water and sediment samples were collected simultaneously for physicochemical and heavy metal analyses. The comet assay was performed as a biomarker of genotoxicity. Fish located downstream had a higher frequency of DNA damage than in the reference site. We found concentrations of Cr and Ni above acceptable levels in sediment samples. Generally, Ba, Mn, Mg, Zn, Cr, and Ni were the elements most associated with genotoxic damage. Water and sediment of the Antas stream showed genotoxic potential in A. lacustris according to the urbanization gradient, demonstrating the importance to prevent the release of environmental pollutants, especially heavy metals in urban areas.

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Myriostoma Desv. is a genus of gasteroid fungi, distinguished from the other star-shaped fungi by the basidioma morphology with multiple pedicels and multi-stomata endoperidium. Studies based on phylogenetic, morphological characteristics and geographical distribution allowed the delimitation of five species in the genus. In Brazil, it is represented by M. calongei Baseia, Sousa & Martín, which distribution was restricted to South and Northeast regions. The present study describes the first records of Myriostoma in central Brazil, including Cerrado biome and Central-West region, thus expanding the known geographic distribution in the country.

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