The cap is convex to flat, dark red to blackish brown with a yellowish edge,[1] very much paler when dry and growing up to 5 cm (2 in) in diameter.

The spores are variable in colour: white, pink, brown have all been observed.

The stipe is a similar colour to the cap, thin, and velvety at the base.

[2][3] Macrocystidia cucumis was originally described in Europe where it is most common, and it is also known from North America, Australia and New Zealand.

It can be found in forests, disturbed grounds and gardens and its preferred substrate is wood debris.