Covers mushrooms and other non-lichenized fungi that form multicellular fruiting bodies large enough to be seen with the unaided eye.

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Scientific names beginning with O:
12 genera
39 species, 0 subspecies and varieties
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Oligoporus caesiusconifer blueing bracket, blue cheese polypore
Oligoporus fragilisstaining cheese polypore
Oligoporus leucospongiamarshmallow polypore, white spongy polypore
Habitat: Oligoporus leucospongia is a spring fungus of the western mountains that grows on conifer and sometimes aspen wood that has been buried in snow.
Oligoporus obductusbone polypore
Oligoporus stipticusbitter bracket
Omphalina pyxidatacinnamon navel
Onnia tomentosawoolly velvet polypore
Habitat: Roots of conifers
Onnia triquetraFalse Dyer's Polypore
Habitat: Pine forests.
Substrate: Pinus boles and roots.
Spores: Annual in fall.
Onygena corvina
Substrate: The two most common species are O. corvina, which occurs on owl pellets, bird carcasses, hair, and wool, and O. equina (Willdenow) Persoon: Fries, found on the decaying horns and hooves of cattle and sheep.
Ophiocordyceps myrmecophilaant-eater, ant fungus
Osteina obducta
Distribution: Primarily in the ranges of Pseudotsuga menziesii and Picea sitchensis. Western North America.
Habitat: Coniferous forests.
Substrate: Wood
Osteina undosa
Distribution: Northern hemisphere.
Habitat: Coniferous forests.
Substrate: Conifer wood.
Otidea alutaceabrown clustered ear cup
Otidea concinna
Spores: The spores are smooth, ellipsoid, 10--12 x 5--6.5 ┬Ám, and contain two large oil drops.
Otidea leporinayellow ear, rabbit-ears, yellow rabbit-ears
Otidea onoticadonkey-ears, hare's-ear
Oxyporus latemarginatusfrothy porecrust