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 B:
Baeospora myosuraconifer-cone Baeospora, conifercone cap, conifer conecap, spruce-cone mushroom
Substrate: Spruce and Douglas fir cones
Spores: (3--4.5 x 2--3 µm) weakly amyloid spores
Baeospora myriadophyllalavender Baeospora
Substrate: Hardwood logs and stumps
Bankera fuligineoalbagrayish white Hydnum, drab tooth
Barssia oregonensisdepressed truffle
Basidioradulum radulatoothed crust
Battarrea phalloidesdesert drumstick, flatcap stalked puffball, scaly-stalked puffball, sandy stiltball
Bertia moriformiswood mulberry
Bisporella citrinaminute lemon cup, yellow fairy cups
Spores: ellipsoid, medium-sized (8--14 x 3--5 µm), and have one crosswall and two oil drops at maturity
Bjerkandera adustasmoky bracket, smoky polypore
Bjerkandera fumosabig smoky bracket
Bolbitius aleuriatusgrey Bolbitius
Bolbitius reticulatusnetted fieldcap
Boletellus mirabilisadmirable bolete, bragger's bolete
Boletopsis leucomelaenakurokawa, kurotake
Boletus barrowsiiwhite king bolete
Distribution: Southwest United States
Habitat: Under ponderosa pines
Boletus calopusbitter beech bolete, bitter bolete
Boletus coniferarumconifer Boletus
Habitat: Low- to mid-elevation conifer forests
Boletus eastwoodiaeAlice Eastwood's Boletus
Boletus edulisking bolete, penny bun, cep, porcini, steinpilz
Habitat: Occurs with conifers.
Boletus fibrillosus
Distribution: Widespread in the PNW
Habitat: Occurs in old-growth forests of fir and western hemlock as well as earlier succession forests of western hemlock and Douglas-fir and other mixed forest stands.
Boletus luridiformisred-stalked bolete, scarletina bolete, slender red-pored bolete
Boletus pulcherrimusred-pored bolete
Boletus regineusqueen bolete
Boletus rex-verisspring king bolete, spring king
Boletus rubellusruby bolete
Habitat: Grassy areas, mossy lawns, or along the edges of trails, always near trees such as oaks, cottonwood, willow, and basswood or linden.
Boletus rubripesbitter bolete, red-stemmed bitter bolete
Distribution: Widespread but not particularly common in the PNW region.
Habitat: It was described from coastal conifer and mixed forests in California, but in the PNW, occurs in montane conifer forests.
Boletus smithiiSmith's Boletus
Boletus subtomentosusboring brown bolete, suede bolete, yellow-cracked bolete
Boletus zelleriZeller's bolete
Distribution: Common in coastal and low elevation conifer forests.
Habitat: Occurs in urban areas, parks, along trails, and in other areas where conifers occur.
Bondarzewia occidentalisBondarzew's polypore, giant mountain polypore
Distribution: Western North America, on conifer roots.
Habitat: Terrestrial in coniferous forests, arising from conifer roots, sometimes at the base of stumps or trees.
Substrate: Terrestrial but on wood.
Bovista pilatumbling puffball
Bovista plumbeagrey puffball, lead-colored puffball, tumbling puffball, tumble-ball
Bridgeoporus nobilissimusfuzzy Sandozi
Distribution: B. nobilissimus is very rare, known only from forests of western Washington and Oregon, and is a protected species in both states.
Habitat: Occurs primarily on very old noble fir, at the base of living trees and snags or on top of stumps.
Brunneoporus malicola
Distribution: Northern Hemisphere.
Habitat: Temperate forests.
Substrate: Hardwoods.
Byssomerulius corium
Description: Effuso-reflexed or resupinate, on hardwoods. Thin, leathery or papery. Cap when present is white or gray, or may be green from algae. Pore surface white, then cream, then light brown.
Distribution: Widespread in northern hemisphere.
Substrate: On branches and twigs of hardwoods.