Comatricha nigra is a widespread species of slime molds in the family Amaurochaetaceae.

[1] It grows on decayed wood on the forest floor.

The sporangium reaches a total height of 2–8 mm, while the black, hair-like stalk is usually two to six times the length of the sporangium.

[2] The color of the sporangium varies as a function of its stage of development, from translucent white, to pink, bright red, and eventually black.

This Amoebozoa-related article is a stub.