JOHN HOWARD / SCIENCE PHOTO LIBRARY JOHN HOWARD / SCIENCE PHOTO LIBRARY
Photograph of bracket fungus growing on a tree trunk. Bracket fungi or polypores, along with mushrooms, toadstools and puffballs, belong to the best-known class of fungi, the basidiomycetes. The shelf-like structure seen here is the basidiocarp, the spore-bearing "fruit" of the fungus. The basidiocarps of bracket fungi can live for many years and often show distinct growth layers.
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