Pseudocolus fusiformis is a stinkhorn mushroom in the Phallaceae, a family well known for a remarkable range of fruit body types. It is commonly known as the stinky squid, because of its fetid odor, and its three or four upright "arms" which are connected at the top. The malodorous smell comes from the dark greenish slimy gleba covering the inside faces of the arms, and attracts insects that help to disperse the spores.

Pseudocolus is a genus of fungi in the stinkhorn family. The fruit bodies have three or four simple arms that are initially joined at the tip, but often break apart. The tips of the arms are covered with a slimy, foul-smelling gleba, which attracts insects that help disperse the spores. The genus contains three species: the type Pseudocolus fusiformis, P. garciae, similar in appearance to the type but with a pinkish to red, rather than orange color, and P. grandis, found in India.