Cap: 3-9cm across Stem: 4-16cm in length, 1-2cm diameter
meaning 'lumpy cap'
Overall: a rare mushroom which is easily identified from other mushrooms in the Bolete family due to its colouration and flesh colour. Despite its size it can be rather difficult to find amongst the leaf litter.
Stem: generally a smoky brown colour which is usally paler at the base. When handled it can discolour blueish. Starts rather velvety like the cap but soon becomes smooth. The base of the stem is usually slightly bulbous.
Flesh: white with buff / vinaceous tints, sometimes turns blue / green near the stem apex. Tubes pinky flesh colour which bruise greenish blue when damaged or handled.
Pores: usually greyish with a pinky colour towards the margin. As the spores develop the pores become more brown in colour, when damaged they can turn a blue/green colour.
Cap: begins velvety but quickly becomes smooth, bruises when handled becoming a blueish colour. Variable in colour from grey to dark brown to olivaceous.
OVERALL: A dark mushroom which when you find them often look like they have 'gone over', it is not until you have them in the hand does it become obvious that it is just how they look. The slightly 'sour' smell, dark overall colour with a bit of 'purple' hue to it, clean cream flesh colour and pink to pink/brown pores are probably unique in the family. It is not a common species at all, in fact it took me many years to find my first (bizarrely since then I have seen it every year since - perhaps because I now know what I am looking for?), I have not yet found a specimen which has not been blemished in someway.
HABITAT: With both deciduous and coniferous trees.
DISTRIBUTION: Rare, a scattered number of records from across the UK but with hot spots in the north-west and Pennine areas. Almost no records from the east of the UK and the south-east.
SEASON: Late summer to autumn. Nearly all our records are from September.
EDIBILITY: Not Edible, too 'sour' to be considered edible and too rare to collect anyway.
EASE OF IDENTIFICATION: The overall dark colour with pinky coloured pores, cream flesh and slight 'sour' smell make this an easy species to identify.
SPORE PRINT: Purple-brown.
SMELL: 'Sour', though I think more like fruit.
SYNONYMS: Porphyrellus pseudoscaber (Secr.) Singer, Boletus porphyrosporus Fr. & Hok, Phaeoporus porphyrosporus (Fr. & Hok) Bataille, Porphyrellus porphyrosporus (Fr. & Hok) Gilbert, Boletus porphyrosporus Fr. & Hök
SIMILAR SPECIES: This species is straightforward to identify, however this two main species one is likely to confuse it with in our opinion are the Bitter Bolete (Tylopilus felleus), which is a much paler mushroom all over with paler pink pores and an obvious white 'net' around the top of the stem. The Chestnut Bolete (Gyroporus castaneus) has white pores and a hollow stem and again is totally different.