An irregular, often off-center-stalked bolete of ash trees with a yellowish to reddish-brown cap and shallow, radially elongated, almost gill-like pores. It is not mycorrhizal: it forms sclerotia around the leafcurl ash aphid on ash roots and feeds on the aphid's honeydew. It belongs to its own family, separate from Gyrodon, where it was once placed.
Edible but of low quality, with an acidic, unpleasant taste (Wikipedia). MushroomExpert gives no edibility information.
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Habitat
Alone, scattered or in groups on the ground under green ash and other ash trees in summer and fall, in symbiosis with the leafcurl ash aphid (Meliarhizophagus fraxinifolii) on ash roots.
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Eastern North America, from eastern Canada south to Alabama and west to Wisconsin, possibly the Southwest, and Mexico. Also reported from Asia (Japan).
Characteristics
Cap: 5-20 cm, irregular, yellowish to reddish brown, dry but tacky when wet, sometimes bruising darker. Pores: radially elongated and almost gill-like with many cross-veins; yellow to olive; often bruising brownish or bluish. Stem: 2-4 cm long, 0.5-2.5 cm thick, usually off-center or lateral; may bruise darker or blue near the base. Flesh: whitish to yellow, sometimes bluing when cut. Spore print: olive brown. Spores: 7-10 x 6-7.5 µm, smooth, ellipsoid.
