|Almost exclusively on Birch trees.
Pale, with a smooth greyish-brown top surface, and a
creamy white underside
10 - 25 cm diameter
Throughout the year, they are annuals and in Britain
they release spores in late summer and autumn.
Tough and bitter. Not worth collecting
It is a necrotrophic parasite on weakened birches, and will
cause brown rot and eventually death, being one of the most
common fungi visible on dead birches. It is likely that the birch
polypore fungus becomes established in small wounds and broken branches
and may lie dormant for years, compartmentalised into a small area by
the tree's own defence mechanisms, until something occurs to weaken the
tree. Fire, drought and suppression by other trees are common causes of
When picking any fungus for consumption,
caution should be exercised at all times.