Mucilago crustacea is a species of slime mould, in the monotypic genus Mucilago, in the family Didymiaceae.

[1] Due to its visual resemblance to canine vomit,[2] it is known colloquially as the "dog sick slime mould"[3] or "dog sick fungus",[4] albeit that slime moulds are not true fungi.

[4] The fruiting body is yellow to white, becoming paler with time, and then blackening.

[3] It usually occurs on damp grass.

[2][5] Media related to Mucilago crustacea at Wikimedia Commons