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Concept
Exsudoporus frostii
Summary
Exsudoporus frostii (formerly Boletus frostii), commonly known as Frost's bolete or the apple bolete, is a bolete fungus first described scientifically in 1874. A member of the family Boletaceae, the mushrooms produced by the fungus have tubes and pores instead of gills on the underside of their caps. Exsudoporus frostii is distributed in the eastern United States from Maine to Georgia, and in the southwest from Arizona extending south to Mexico and Costa Rica. A mycorrhizal species, its fruit bodies are typically found growing near hardwood trees, especially oak.
Exsudoporus frostii mushrooms can be recognized by their dark red sticky caps, the red pores, the network-like pattern of the stipe, and the bluing reaction to tissue injury. Another characteristic of young, moist fruit bodies is the amber-colored drops exuded on the pore surface. Although the mushrooms are considered edible, they are generally not recommended for consumption because of the risk of confusion with other poisonous red-pored, blue-bruising boletes. B. frostii may be distinguished from other superficially similar red-capped boletes by differences in distribution, associated tree species, bluing reaction, or morphology.
The species was named by the Unitarian minister John Lewis Russell of Salem, Massachusetts, based on specimens found in Brattleboro, Vermont. He named the fungus after his friend, fellow amateur American mycologist Charles Christopher Frost, who published a description of the species in his 1874 survey of the boletes of New England. When the name of a species is contributed by an individual, but the name is formally published by another, the contributor's name can be cited, separated from the publishing author as apud; for this reason, the name and authority are written Boletus Frostii Russell apud Frost in some older literature. Bernard Ogilvie Dodge made reference to B.
Official source
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