Bracket Fungus
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Polypore
Their sides are covered with a spore-forming surface, the hymenium.
The tubes offer shelter for developing spores and help to increase the area of the spore-producing surface.
Pore size and shape vary a lot between species, but little within a species – some Hexagonia spp. have 5 mm wide pores whereas pores of Antrodiella spp. are invisible to naked eye with 15 pores per mm.
Generally the larger the pores, the larger the spores.
Common & widespread in Britain during Autumn.