Aureoboletus russellii, commonly known as the jagged-stemmed bolete[2] or Russell's bolete, is a species of bolete fungus in the family Boletaceae. The fruit bodies are characterized by their coarsely shaggy stem. The yellow-brown to reddish-brown caps are initially velvety, but become cracked into patches with age.
An edible species, it is found in Asia and eastern North America, where it grows in a mycorrhizal association with oak, hemlock, and pine trees.
The cap is hemispheric to convex or broadly convex, reaching a diameter of 3–13cm (1+1⁄4–5in).[2] The cap surface is initially velvety, with a margin rolled inward, but after maturing the cap becomes cracked and forms scale-like patches.[2] The color is yellow-brown to reddish-brown to olive-gray, while the flesh is pale yellow to yellow.[2] The pore surface is yellow to greenish yellow;[2] when the pore surface is rubbed or injured it will turn a brighter yellow color. The pores are angular, and about 1mm wide, while the tubes that comprise the pores are up to 2cm (3⁄4in) deep.
The stem is up to 20cm (8in) long and 1–2cm (3⁄8–3⁄4in) thick, and either roughly equal in width throughout, or slightly thicker at the base.[2] Reddish brown to pinkish tan in color, the stem is solid (i.e. not hollow or stuffed with a pith), sometimes curved and viscid at the base. The surface texture is characterized by deep grooves and ridges, with the ridges torn and branched so as to appear shaggy.[2] No partial veil or ring are present.[2]
The spore print is olive brown.[2] The spores are ellipsoid, measuring 15–20 by 7–11μm.[9] Similar to the reticulation of the stem,[8] the spore surfaces have deep longitudinal grooves and furrows, sometimes with a cleft in the wall at the top of the spore.[9]
Similar species
Aureoboletus betula is somewhat similar in stature and also has a deeply reticulate stem, but can be distinguished by its smooth, shinier cap and spores with pits.[9]Boletellus ananas is somewhat similar.[2]
Habitat and distribution
Aureoboletus russellii is known from eastern North America,[10] where it grows singly or scattered on the ground in association with oak, hemlock, and pine trees. The geographic range extends from eastern Canada south to Central America,[8] and west to Michigan and southern Arizona. It is also found in Asia, including Korea[11] and Taiwan.[12]
Uses
The fruit bodies are edible,[9] but of low culinary interest due to being soft and little flavour.[2][8]
1 2 3 4 Roberts P, Evans S (2011). The Book of Fungi. Chicago, Illinois: University of Chicago Press. p.327. ISBN978-0226721170.
1 2 3 4 5 Bessette AE, Roody WC, Bessette AR (2000). North American Boletes. Syracuse, New York: Syracuse University Press. pp.86–7. ISBN9780815605881.
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