Lactarius pseudomucidus, commonly known as the slimy milk cap,[1] is a North American species of fungus.

It has a charcoal brown cap, smooth and slimy, from 2–10 centimetres (3⁄4–4 in) across, initially flat convex, becoming shallowly depressed.

Spores are white in mass, ellipsoid, amyloid, about 8 μm long, with a reticulate decoration on the surface.

[1] It resembles Lactarius argillaceifolius, which has a light orange-gray cap,[7] and eastern North America's L. mucidus.

[3] Other Lactarius species with slippery, grayish caps are either zonate and/or the gills stain purple.