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Porphyrellus porphyrosporus
Species of fungus From Wikipedia, the free encyclopedia
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Porphyrellus porphyrosporus, commonly known as the dusky bolete, is a rare fungus belonging to the family Boletaceae. With its purple-brown cap and stem, P. porphyrosporus is not easy to spot, despite its large size. It is a large (both cap diameter and stem length up to 15 cm) brown bolete. Found in Europe and North America in summer and autumn, the species occurs under trees.
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Description
This mushroom has a dark brown cap, usually with a paler margin.[2] Initially convex, caps expand and sometimes become irregularly lobed. It is 6 to 15 cm (2+1⁄4 to 6 in) in diameter[3] when fully expanded, and the caps have soft buff flesh with a vinaceous tinge. The tubes are similar in colour to the cap, and when cut or bruised, turn blue-green.[2] The stem is 5 to 16 cm (2 to 6+1⁄4 in) tall and 1 to 3 cm (3⁄8 to 1+1⁄8 in) in diameter, equal or clavate,[3] tobacco brown and slightly velvety to the touch when young, becoming smooth as the fruit body matures. The flesh is white, producing blue stains which change color.[4] The mushroom has a mild to pungent smell and a mild to bitter taste.[4] The spore print is reddish-brown.[4]
Similar species
It might overlap with P. atrofuscus and P. olivaceobrunneus.[4] Tylopilus griseocarneus[4] and T. indecisus are similar.[3]
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Distribution and habitat
It is a widespread species of Europe, especially in the north, but is nowhere particularly common. It can be found in northern North America.[4]
The fruit bodies appear from late summer to autumn,[4] often in small groups, associated with broad-leaved trees such as beech[4] and oak.
Edibility
One guide lists the species as edible,[5] while another considers it "probably edible".[6]
References
Further reading
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