Fungi: Basidiomycota: Agaricomycetes: Boletales: Diplocystidiaceae: Astraeus hygrometricus (Pers.) Morgan
Synonyms: Astraeus stellatus, Geaster decaryi, Geaster hygrometricum, Geastrum argentum, Geastrum castaneum, Geastrum commune, Geastrum decaryi, Geastrum diderma, Geastrum hygrometricum, Geastrum stellatum, Geastrum vulgare, Geastrum vulgaris, Lycoperdon stellatum, Lycoperdon stellatus.
Common names: barometer earthstar, Hygroscopic Earthstar.
Extract from Wikipedia article: Astraeus hygrometricus, commonly known as the hygroscopic earthstar, the barometer earthstar, or the false earthstar, is a species of fungus in the family Diplocystaceae. Young specimens resemble a puffball when unopened. In maturity, the mushroom displays the characteristic earthstar shape that is a result of the outer layer of fruit body tissue splitting open in a star-like manner. The false earthstar is an ectomycorrhizal species that grows in association with various trees, especially in sandy soils. A. hygrometricus was previously thought to have a cosmopolitan distribution, though it is now thought to be restricted to Southern Europe, and Astraeus are common in temperate and tropical regions. Its common names refer to the fact that it is hygroscopic (water-absorbing), and can open up its rays to expose the spore sac in response to increased humidity, and close them up again in drier conditions. The rays have an irregularly cracked surface, while the spore case is pale brown and smooth with an irregular slit or tear at the top. The gleba is white initially, but turns brown and powdery when the spores mature. The spores are reddish-brown, roughly spherical with minute warts, measuring 7.5–11 micrometers in diameter.
Armenian: Աստղիկ հիգրոմետրիկ, Czech: Hvězdák vlhkoměrný, Dutch: Weerhuisje (paddenstoel), Estonian: Baromeeterseen, Georgian: მიწისვარსკვლავა, German: Gemeiner Wetterstern, Japanese: ツチグリ (菌類), Polish: Promieniak wilgociomierz, Russian: Звездчатка гигрометрическая, Serbian: Влагомерна звездица, Swedish: Väderspåstjärna, Thai: เห็ดเผาะ, Ukrainian: Астреус гігрометричний.
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