Geastrum sp. ostiole
An Earthstar (the genus Geastrum ) looks like a puffball on a star-like base. The spore sack may sit directly on the star-like base or be raised on a short stalk. The apical opening through which the spores are released may be a fairly simple affair or more complex, such as the conical, pleated structure on Geastrum pectinatum .
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