The Luminous Russula is a high-fantasy mushroom with a cap that glows softly in the dark, featuring a smooth, slightly convex shape that transitions into a sturdy, cylindrical stem. The cap's surface is adorned with subtle, radial grooves leading to the edges, which are slightly upturned, revealing delicate gills underneath that emit a faint, bioluminescent light. The stem is textured with fine, vertical striations, giving it a natural, organic feel. The overall coloration is a deep, vibrant red for the cap, contrasting with a pale, almost translucent white for the stem and gills, enhancing its mystical appearance.