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Mycena leptocephala
''Mycena leptocephala'', commonly known as the nitrous bonnet, is a species of fungus in the Mycenaceae family. The mushrooms have conical grayish caps that reach up to in diameter, and thin fragile stems up to long. The gills are gray and distantly spaced. The spores are elliptical, typically measure 7–10 by 4–6 μm, and are white in deposit. When viewed under a light microscope, the gills has abundant spindle-shaped cystidia on the gill edges, but few on the gill faces. The mushroom is found in North America and Asia, where it grows singly or in groups on conifer needles, cones and sticks on the forest floor. It has a distinctive odor of bleach; the edibility is unknown. Similar species include ''Mycena alcalina'', ''M. austera'', and ''M. brevipes''.
==Taxonomy==
The species was first called ''Agaricus leptocephalus'' by Christian Hendrik Persoon in 1800,〔 and was transferred to the genus ''Mycena'' in 1876 by French mycologist Claude-Casimir Gillet.〔 Synonyms include ''Agaricus alcalinus'' var. ''leptocephalus'' (Fries, 1821),〔 ''Mycena alcaline'' var. ''chlorinella'' (J.E. Lange, 1914),〔 and ''Mycena chlorinella'' (Singer, 1936).〔 The latter was reduced to synonym in a 1980 publication by Dutch ''Mycena'' specialist Maas Geesteranus.〔
''Mycena leptocephala'' is classified in the section ''Fragilipedes'' of the genus ''Mycena'', along with other similar-looking mushrooms, such as ''M. aetites'', ''M. austera'', ''M. parca'', and ''M. aronsenii''. Some of these have a nitrous smell similar to ''M. leptocephala''.〔
The specific epithet ''leptocephala'' is derived from the Greek λεπτος ''leptos'', "thin" and κεφαλη ''kephale'', "head",〔 and refers to the delicate cap.〔 The mushroom is commonly known as the "nitrous bonnet".〔
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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