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Rhizina undulata : ウィキペディア英語版 | Rhizina undulata
''Rhizina undulata'', commonly known as the doughnut fungus or the pine firefungus, is a species of fungus in the genus ''Rhizina'', family Rhizinaceae. The fruit bodies are dark purple brown with a bright yellow margin, crust-like and attached to the growing surface by numerous root-like yellow rhizoids. ''R. undulata'' has a cosmopolitan distribution, and commonly occurs on clearings or burned areas throughout central and northern Europe, North America, northern Asia, and southern Africa. It is parasitic on conifer seedlings, and has caused considerable damage to tree plantations worldwide. ==Taxonomy== The fungus was first described in 1774 as ''Helvella inflata'' by the German polymath Jacob Christian Schäffer. It acquired its current name in 1815 by virtue of its publication in Elias Magnus Fries's ''Observationes mycologicae''.〔 The specific epithet ''undulata'' means "wavy" or "undulating". Common names that have been used to refer to the species include "crust-like cup", "pine-fire cushion",〔 "doughnut fungus",〔 and "pine firefungus".〔
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