earthstar

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earthstar

[′ərth‚stär]
(mycology)
A fungus of the genus Geastrum that resembles a puffball with a double peridium, the outer layer of which splits into the shape of a star.
References in periodicals archive ?
British puffballs, earthstars and stinkhorns: an account of the British gasteroid fungi.
New sources of taxonomic information for earthstars (Geastrum, Geastraceae, Basidiomycota): phenoloxidases and rhizomorph crystals.
As out of this world as it seems, though, the UFO you've spotted has a distinctly terrestrial identity: It's an earthstar, a relative of the puffball family:
Even more impressive is the barometer earthstar, so named because its arms react to the amount of moisture in the air.