Boletus pulverulentus
Underside of cap showing pores and bruising
Spore print
Spores
TS of cap
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Boletus pulverulentus Opat., 1836
Description: Medium sized boletes, solitary to scattered in a citrus grove (oranges) on soil, in shaded areas.
Pileus: Convex to broadly convex, smooth and dry (not sticky), initially reddish brown changing to blackish goo with age; diameter about 60mm.
Stipe: Yellowish near the apex darkening to red towards the base, straight to slightly tapering, solid.
Pores: Angular, bright yellow but darkening with age.
Spore print: Brownish.
Flesh: Bright yellow changing instantly to blue-green -> blue, in all tissues on cutting or bruising. Note areas eaten by slugs retain the yellow colour.
Colour tests:
Iron sulphate and KOH - reverses blue colour change;
Ammonia (10%) - reverses blue colour change but
colour of pores changes to brown.

Microscopy:
Cystidia: Fusiform-cylindrical.
Spores: Ellipsoid-ellongated, smooth;
10.6-14.0µm x 4.7-5.5µm, Q=2.08-2.64, Qm=2.39
CS2 Buskett (28/9/09)
Spore print
Links:
Index Fungorum
Wisconsinmushrooms
MushroomExpert
Underside of cap
Spores
TS of cap showing 'tubes' (pores) and blue colour change
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BOLETALES
Boletaceae