Russula uncialis is a small, fragile mushroom with a velvety red cap with a slightly darker disc and a cuticle that begins to show cracks as it matures. The white gills are broadly attached, close and sometimes forked at the stem apex and are somewhat serrate. The spore print is white. The stem is white flushed with rose. No parts stain. Russula unicalis is mycorrhizal with hardwoods, particularly oak and beech. It can be found in summer and early autumn. Edible.