Phlegmacium luteiaureum is a litlle-known species of mushroom-forming fungus in the family Cortinariaceae. First described in 2014 as Cortinarius luteiaureus, it was reclassified in 2022 based on genomic analysis. The epithet luteiaureum refers to the distinctive yellow to brownish yellow colouration of its cap, which measures 4–7 cm in width and has a very sticky surface. The mushroom features greyish white to pale greyish brown gills, a white stem with distinctive yellow ring-like zones formed by the universal veil, and white flesh with no recorded odour. Its spores are narrowly almond-shaped with moderate to strong surface warts and often contain dark red brown angular granules. This fungus is found in northern Finland, where it grows on the ground in coniferous forests.

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