''Retiboletus griseus'', commonly known as the gray bolete, is a species of

bolete A bolete is a type of mushroom, or fungal fruiting body. It can be identified thanks to a unique cap. On the underside of the cap there is usually a spongy surface with pores, instead of the gills typical of mushrooms. A similar pore surface i ...

fungus in the family

Boletaceae The Boletaceae are a Family (biology), family of mushroom-forming fungi, primarily characterised by small pores on the spore-bearing hymenium, hymenial surface (at the underside of the mushroom), instead of Lamella (mycology), gills as are found ...

. The species was first described scientifically in 1878 by American botanist

Charles Christopher Frost Charles Christopher Frost (November 11, 1805 – March 16, 1880) was an American mycologist. He described several species of fungi from the New England area of the United States. In one paper, Frost described 22 new species of boletes, and he wa ...

. It was transferred to ''

Retiboletus ''Retiboletus'' is a genus of fungi in the family Boletaceae. The genus, first described in 2002, contained six species distributed in north temperate regions. Species , Index Fungorum lists the following species: References External links

'' in 2002. The grayish cap is convex, wide, and soft or leathery. The stem is yellowish, 4–10 cm tall and thick. The flesh is whitish and can stain tannish. The

spore print 300px, Making a spore print of the mushroom ''Volvariella volvacea'' shown in composite: (photo lower half) mushroom cap laid on white and dark paper; (photo upper half) cap removed after 24 hours showing warm orange ("tussock") color spore print. ...

is olive brown. Lookalikes include '' R. vinaceipes'', ''

Tylopilus griseocarneus ''Tylopilus griseocarneus'' is a fungus of the family Boletaceae. Described as new to science in 1989, it is found in the coastal plains of southern New Jersey and southern Louisiana in the United States, where it grows in sandy soil under oak an ...

'', '' T. variobrunneus'', and ''

Leccinum albellum ''Leccinellum albellum'' is a species of bolete fungus in the family Boletaceae. Taxonomy Originally described by Charles Horton Peck as a species of ''Boletus'', and, after 1945, usually considered a species of ''Leccinum'', it was transferr ...

''. It can be found under

oak An oak is a hardwood tree or shrub in the genus ''Quercus'' of the beech family. They have spirally arranged leaves, often with lobed edges, and a nut called an acorn, borne within a cup. The genus is widely distributed in the Northern Hemisp ...

trees in eastern North America from June to September.

References

External links

* Boletaceae Fungi described in 1878 Fungi of North America Fungus species {{Boletales-stub