Cortinarius orellanus is a species of mushroom belonging to the Cortinarius genus, commonly found in forests across Europe and parts of North America. It typically grows in association with coniferous trees, particularly pine and spruce. The mushroom features a distinctive brown cap that can reach up to 10 cm in diameter and has a fibrous texture. This species is known for its toxic properties, containing compounds that can cause severe kidney damage if ingested. Symptoms of poisoning may not appear until several days after consumption, making it particularly dangerous. Due to its resemblance to edible mushrooms, caution is advised when foraging.