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Heimioporus betula

[ Basidiomycetes > Boletales > Boletaceae > Heimioporus . . . ]

by Michael Kuo

This beautiful bolete has an amazing stem that is deeply, coarsely reticulate and, when the mushroom is in the "button" stage, often as wide as, or even wider than, the cap. With development the stem stretches out dramatically, becoming quite long. The cap is reddish to yellow or orange, and the non-bruising pore surface is yellow, becoming slightly greenish with age. Under the microscope, Heimioporus betula features very finely pitted spores. It is found under oaks, or in mixed woods of pine and oak, primarily in the southern Appalachians.

Description:

Ecology: Mycorrhizal with oaks (and perhaps other hardwoods) and with pines, especially in mixed pine-oak woods; growing alone or scattered; summer and fall; fairly widely distributed from Michigan and Pennsylvania to the southeastern United States; especially common in the southern Appalachian Mountains.

Cap: 3-9 cm; convex to broadly convex in age; moist to slimy when fresh; shiny when dry; bald; often becoming pitted or wrinkled with age; yellow, orangish, reddish, or reddish brown; with a tiny sterile margin.

Pore Surface: Often sunken at the stem in maturity; yellow, becoming greenish yellow; not bruising; with 1-2 angular pores per mm; tubes to 1.5 cm deep.

Stem: 10-30 cm long; 1-2.5 cm thick; tapered to apex, or more or less equal; deeply and coarsely reticulate with a yellow reticulum that reddens with age; solid; yellow above and reddish below, becoming more reddish overall; basal mycelium white; base attached to white rhizomorphs.

Flesh: Yellow, with reddish areas in the stem; not bruising when exposed.

Odor and Taste: Not distinctive.

Chemical Reactions: Not documented.

Spore Print: Olive to olive brown.

Microscopic Features: Spores 13-22 x 6-10 µ; finely pitted; narrowly ellipsoid.

REFERENCES: (Schweinitz, 1822) Horak, 2004. (Coker & Beers, 1943; Smith & Thiers, 1971; Smith, Smith & Weber, 1981; Weber & Smith, 1985; Lincoff, 1992; Both, 1993; Bessette, Roody & Bessette, 2000; Roody, 2003; Miller & Miller, 2006; Binion et al., 2008.) Herb. Kuo 10030904.

Austroboletus betula, Boletellus betula, Boletus betula, Heimioporus alveolatus, and Boletus morgani are synonyms.

Further Information Online:

Boletus betula in Smith & Thiers, 1971
Heimioporus betula at Macrofungi of Costa Rica

 

Heimioporus betula

Heimioporus betula

Heimioporus betula

Heimioporus betula

Heimioporus betula



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Kuo, M. (2010, March). Heimioporus betula. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/heimioporus_betula.html