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Thread-like, 2 to 5 cm long and 0.5 to 1 mm in diameter, sometimes branching. Initially black near the sterile base and whitish with conidia (asexual spores) towards the tips, the whole of the fruitbody eventually blackens.
It grows only from the hard outer cases of Beech seeds, which are known as Beechmast.
All year round.
Producing ascospores in autumn and early winter, at which times the whole fruitbody turns black.
Appears to be widespread and fairly frequent in Britain.
Status in Leicestershire and Rutland not known.
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