The 'sulphur shelf',
Laetiporus sulphureus, a distinctive yellowish bracket fungus found on the stems of rotting trees. It has a texture extraordinarily similar to chicken. Pleasantly flavoured when ripe, it is inedibly tough when older.
One of the very few wild mushrooms traditionally eaten in England. See:
Cep or Penny Buns
Chanterelles
Chicken-of-the-woods
Giant Puffball or Puff-Fist
Morel or Sponge Mushroom