05/29/2026
Check out this moon poo our staff found at the Comden-Towle Model Forest! 🌕✨
Moon poo, also called false puffball, is a slime mold that grows on dead trees in damp areas of forests throughout the world. Although they can resemble fungi and grow in similar habitats, slime molds are actually formed by groups of amoebas. Moon poo starts out looking like a cluster of small, white eggs before it transforms into a smooth, pearlescent white mass about half the size of a golf ball, like the one pictured. It later becomes silvery and papery as brown spores develop inside. After the spores have dispersed, the moon poo disappears and leaves behind a dark stain on the tree bark. Fun fact: The name moon poo comes from its common name in Mexico, “caca de luna,” which translates to "moon’s excrement."
Learn more about slime molds:
https://www.pbs.org/newshour/science/the-sublime-slime-mold
Learn more about moon poo:
https://ultimate-mushroom.com/slime-molds/480-enteridium-lycoperdon.html
https://www.mushroom-appreciation.com/false-puffball.html