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(order Boletales)

A genus of fungi in which the spores are borne on gills and in masses appear yellowish-brown to olive-brown. P. involutus is mushroom-shaped, with a brown pileus and stipe; the rim of the cap is characteristically inrolled. This species, which is poisonous, is very common in broad-leaved woods and on acid heathland.

Subjects: Plant Sciences and Forestry.

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