Xerocomus ferrugineus

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Xerocomus ferrugineus

8 September 2020 Surrey. Photograph copyright Leif Goodwin

Synonymns

Boletus spadiceus, Boletus citrinovirens, Xerocomus subtomentosus var. ferrugineus

Cap

Convex, velvety, brown, olive brown or reddish brown, less commonly olive green, margin overhanging, to about 10 cm across

Pores

Large, irregular, lemon yellow when young, becoming greenish yellow with age, reddish at the margin

Stem

Cylindrical to club shaped, often cracking and the flesh curling back, pale yellow to pale brown, decorated with small rusty spots, sometimes with a coarse network, yellow mycelium visible at the base

Flesh

Firm, whitish to pale yellow in the cap, tinged pinkish in the stem

Smell

Pleasant

Taste

Mild

Season

Late summer to autumn

Distribution

Infrequent

Habitat

In coniferous and mixed woods

Spore Print

Olive green to brown

Microscopic Features

Spores spindle shaped, smooth (10-16) x (4-6) µm2

Edibility

Edible, mediocre

Notes

A drop of KOH turns the cap deep red, and the flesh and stem surface orange. A drop of ammonia solution on the cap surface flashes green blue, and then slowly reddish brown. This species is easily confused with Xerocomus subtomentosus and Xerocomus chrysonemus.

Additional Photographs

Xerocomus ferrugineus

8 September 2020 Surrey. Photograph copyright Leif Goodwin

Xerocomus ferrugineus

Spores in Melzer's solution viewed with a x100 immersion objective. 8 September 2020 Surrey. Photograph copyright Leif Goodwin