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Geastrum saccatum
''Geastrum saccatum'', commonly known as the rounded earthstar, is a species of mushroom belonging to the ''Geastrum'' genus. It has a worldwide distribution and is found growing on rotting wood. It is considered inedible by mushroomers because of its bitter taste. It is a common mushroom, but collections are at their peak during late summer. The opening of the outer layer of the fruiting body in the characteristic star shape is thought to be due to a buildup of calcium oxalate crystals immediately prior to dehiscence. ''G. saccatum'' is distinguished from other earthstars by the distinct circular ridge or depression surrounding the central pore. In Brazil, its common name translates to "star of the land".
==Description==
The immature fruiting body is in diameter and tall. Initially, the fruiting body is egg-shaped–similar in appearance to puffballs–and has strands of mycelia (rhizomorphs) at the base that attach it to the growing surface. The 'skin,' or peridium, is composed of two separate layers: the outer layer (''exoperidium''), which is a golden tan to yellowish brown color, separates away from the inner basidiocarp and splits into several rays that curve backward (recurve) to the base. The mushroom is in diameter after the rays have expanded. Unlike some other members of the genus ''Geastrum'' (such as ''Geastrum fornicatum'') the arms do not push the basidiocarp off the ground; rather, it lies flat. The inner spore-bearing basidiocarp is broad, and has a central pore surrounded by a circular dull-brown apical disc; the disc is distinctly ridged or depressed.〔 The inside of the interior sphere is white when young, but matures into a mass of brown, powdery spores mixed with thick-walled fibres known as capillitium.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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