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Western Jack-O'-Lantern (Omphalotus olivascens)

The western jack-o'-lantern (Omphalotus olivascens) is a poisonous mushroom known for its olive-orange cap, decurrent gills (extending down the stipe), and growth on wood. Fresh specimens also have the remarkable ability to glow in the dark, giving rise to the common name. Some mycologists believe this bioluminescence is designed to attract nocturnal arthropods, who then inevitably aid in spore dispersal. In fact, studies have proven that bioluminescent fungi do indeed attract more visitors in the night. However, it is also possible that this glow is simply a coincidental byproduct of energy transformation.


Western jack-o'-lantern (Omphalotus olivascens) - one of California's few species of bioluminescent fungi. Group of three mushrooms glowing in the dark. Focus-stacked composite of four 30-minute exposures taken in a dark room. Collected near Lake Berryessa, Napa County, California, USA.
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Western jack-o'-lantern mushroom (Omphalotus olivascens) exhibiting its bioluminescence. Focus-stacked composite of three 20-minute exposures taken in a dark room. Collected near Lake Berryessa, Napa County, California, USA.
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Western jack-o'-lantern (Omphalotus olivascens). Vacaville, Solano County, California, USA.
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Western jack-o'-lantern (Omphalotus olivascens). Lake Berryessa, Napa County, California, USA.
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Next: Palomino cup (Peziza repanda)



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All images copyright Timothy Boomer. All rights reserved worldwide.