17 September 2020 Hampshire. Photograph copyright Leif Goodwin.
Convex, expanding with age, felty then smooth, yellow brown, brown or reddish brown, bruising dark blue, to about 10 cm across
Lemon yellow, rapidly bruising dark blue
Lemon yellow at the apex, pale below usually covered with brown or red dots, brusing dark blue, white mycelium at base
Yellow, sometimes with dark red areas in the stem, rapidly bruising dark blue
With deciduous trees, favouring oak
Spores subfusiform, smooth (11-15) x (4.5-5.5) µm2
Edible, mediocre, but should not be eaten in large quantities as the flesh accumulates arsenic
This species looks rather like a Xerocomus but it is readily distinguished by the dark blue colour change
This photograph was taken a few seconds after the specimen was sectioned. 17 September 2020 Hampshire. Photograph copyright Leif Goodwin.
Spores in Melzer's solution viewed with a x100 immersion objective. 17 September 2020 Hampshire. Photograph copyright Leif Goodwin.