Cyanoboletus pulverulentus

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Cyanoboletus pulverulentus

17 September 2020 Hampshire. Photograph copyright Leif Goodwin

Synonymns

Boletus pulverulentus

Common Name

Inkstain Bolete

Cap

Convex, expanding with age, felty then smooth, yellow brown, brown or reddish brown, bruising dark blue, to about 10 cm across

Pores

Lemon yellow, rapidly bruising dark blue

Stem

Lemon yellow at the apex, pale below usually covered with brown or red dots, brusing dark blue, white mycelium at base

Flesh

Yellow, sometimes with dark red areas in the stem, rapidly bruising dark blue

Smell

Fungal

Taste

Mild

Season

Autumn

Distribution

Infrequent

Habitat

With deciduous trees, favouring oak

Spore Print

Sepia brown

Microscopic Features

Spores subfusiform, smooth (11-15) x (4.5-5.5) µm2

Edibility

Edible, mediocre, but should not be eaten in large quantities as the flesh accumulates arsenic

Notes

This species looks rather like a Xerocomus but it is readily distinguished by the dark blue colour change

Additional Photographs

Cyanoboletus pulverulentus

This photograph was taken a few seconds after the specimen was sectioned. 17 September 2020 Hampshire. Photograph copyright Leif Goodwin

Cyanoboletus pulverulentus

Spores in Melzer's solution viewed with a x100 immersion objective. 17 September 2020 Hampshire. Photograph copyright Leif Goodwin