Boletellus russellii, also known as Russell's bolete or the bitter bolete, is a species of fungus belonging to the Boletaceae family. This Basidiomycete mushroom is typically found in North America, particularly in the Pacific Northwest region, growing in coniferous forests, often in association with Western hemlock or Douglas fir trees.
The cap of Boletellus russellii is convex to broadly convex when young, becoming flat or slightly depressed with age, and can reach a diameter of up to 15 centimeters. Its coloration varies from light reddish-brown to chocolate-brown, occasionally exhibiting shades of yellow or olive. The pore surface, found on the underside of the cap, is initially pale and later develops a reddish-brown color, while the pores themselves are angular and radially elongated.
One of the distinguishing features of Boletellus russellii is its taste, which is notably bitter. Hence, the common name "bitter bolete" highlights this characteristic, although it should be noted that taste can be subjective and may vary among individuals. This mushroom is non-toxic, and while it is generally considered inedible due to its bitter taste, it is not known to cause any severe adverse effects.
Boletellus russellii is part of a mycorrhizal relationship, forming mutually beneficial associations with certain tree species. The fungus provides nutrients to the host tree while obtaining necessary carbohydrates in return. Its ecological role, precise distribution, and conservation status are areas that may require further study and investigation.
