Omphalotus
''Omphalotus'' is a genus of basidiomycete mushroom, in the family Marasmiaceae, formally circumscribed by Victor Fayod in 1889. Members have the traditional cap and stem structure. They are saprobic, and fruit in clumps on the ground, adjacent to host trees. The best known and type species is the jack-o'-lantern mushroom ''(Omphalotus olearius)''. Species of ''Omphalotus'' have been mistaken for chanterelles. All ''Omphalotus'' species are presumed poisonous, causing gastrointestinal symptoms. Some ''Omphalotus'' species have bioluminescent properties. Taxonomy Victor Fayod originally erected the genus with '' Pleurotus olearius'' and '' P. eryngii'' as its principal species in 1889, placing it in a ''tribus'' ("alliance") with the genera '' Pleurotus'' and '' Pleurotellus''. The relationships of the genus have become clearer with genetic analysis. Rolf Singer placed it and the related ''Lampteromyces'' in the Boletales due to the presence of the pigment variegatic a ...
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Omphalotus Olearius
''Omphalotus olearius'',Singer R (1948) In: ''Pap. Mich. Acad. Sci.'' 32: 133 ('1946'). commonly known as the jack-o'-lantern mushroom, is a poisonous Orange (color), orange gilled mushroom that to an untrained eye appears similar to some Cantharellus, chanterelles. It is notable for its bioluminescence, bioluminescent properties. It is found in woodland areas in Europe, where it grows on decaying stumps, on buried roots or at the base of hardwood trees. It has also been reported from the Western Cape, Western Cape Province, South Africa. A similar, but phylogenetically distinct species found in eastern North America is ''Omphalotus illudens''. Unlike chanterelles, ''Omphalotus olearius'' and other ''Omphalotus'' species contain the toxin illudin S, and are poisonous to humans. While not lethal, consuming this mushroom leads to very severe cramps, vomiting, and diarrhea. Description The jack-o'-lantern mushroom is orange. Its bioluminescence, a blue-green color, can be observ ...
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