Usually found growing solitary, this large imposing bracket fungus may occasionally occur in tiers, particularly on the cut ends of felled oak trunks. It is seldom seen on other kinds of hardwood timber.
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All year round but sporulating from late Summer till Autumn.
In broadleaf woodland on dead Oak, occasionally on Sweet Chestnut.
The pores are in the form of large slots interconnected and form a maze-like structure with the slots generally aligned radially. The gill-like slots are ochraceous and 10-40mm deep.