The "Sulphur Shelf" fungus, a.k.a. "Chicken of the Woods".
Individual "shelves" range from 2"-10" across. These shelves are made up of many tiny tubular filaments (hyphae). The mushroom grows in large brackets - some have been found that weigh over 100 pounds. It is most commonly found on wounds of trees, mostly oak, though it is also frequently found on eucalyptus, yew, sweet chestnut, and willow, as well as conifers in some species. Laetiporus species produce brown rot in the host on which they grow.
Young fruiting bodies are characterized by a moist, rubbery, sulphur-yellow to orange body sometimes with bright orange tips. Older brackets become pale and brittle almost chalk-like, mildly pungent, and are often dotted with beetle or slug/woodlouse holes. This fungus causes a brown cubical rot and embrittlement which in later stages ends in the collapse of the host tree, as it can no longer flex and bend in the wind.
Spotted off a neighborhood tree on October 18, 2016.
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