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Lepiota castaneidisca
''Lepiota castaneidisca'' is a species of agaric fungus in the family Agaricaceae. Formally described in 1912, it was for a long time considered the same species as the similar ''Lepiota cristata'' until molecular analysis reported in 2001 demonstrated that it was genetically distinct. It is most common in coastal and northern California, and has also been recorded in Mexico. A saprobic species, it is usually found under redwood and Monterey cypress. Its fruit bodies (mushrooms) have white caps with an orange-red to orange-brown center that measure up to wide. The cream-colored to light pink stems are up to long by thick, and have a ring. ''L. castaneidisca'' can be distinguished from other similar ''Lepiota'' species by differences in habitat, macroscopic, or microscopic characteristics.
==Systematics==
The species was first described as new to science by mycologist William Alphonso Murrill in 1912. Murrill collected the type material growing near redwoods near Searsville Lake, California, in December 1911.〔 In 1914,〔 Murrill decided that the species was the same as ''Lepiota cristata'' (which he called ''Lepiota conspurcata'' (Willd.) Morgan); this opinion was later corroborated by Walter Sundberg in 1989 after he studied the type collection and concluded that the microscopic characteristics of both were the same.〔 Using molecular analysis based on comparing DNA sequences of the internal transcribed spacer region, mycologist Else Vellinga determined that despite the lack of distinguishing micro-morphological characteristics, the two species were distinct.〔
The epithet ''castaneidisca'' refers to the chestnut-colored center of the cap. ''Lepiota'' means "the scaly one".〔
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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