Astraeus hygrometricus, commonly known as the hygroscopic earthstar, your barometer earthstar, or the false earthstar, is often a species of fungus inside the Diplocystaceae family. Youthful specimens resemble a new puffball when youthful and unopened. With maturity, the mushroom demonstrates the characteristic earthstar shape that is a result of the outer covering of fruit entire body tissue splitting open in a very star-like manner.
Astraeus Hygrometricus
