Gyroporus castaneus

Gyroporus castaneus, or commonly the chestnut bolete, is a small, white-pored relation of the Boletus mushrooms. It has a brown cap, and is usually found with oak trees. It differs from the true boletes in that the spores are a pale straw colour.
Taxonomy
The species was described initially by the French mycologist Jean Baptiste François Pierre Bulliard (1742–1792). Formerly a member of the Paxillaceae family, research now places this mushroom in Gyroporaceae. Gyroporus means 'having round pores', and castaneus is a reference to the chestnut colouration.
Description
The cap is from 3 to 10 cm in diameter, and pale to rusty brown in colour, which becomes darker with age. The stem is a similar colour, although it may be lighter at the apex. If the stem is cut vertically, it is usual to find several cavities of differing sizes inside. Both the cap and the stem have a tendency to crack or split in dry periods...