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Bleeding Oak Crust (Stereum gausapatum)

The bleeding oak crust (Stereum gausapatum) is a shelf or bracket fungus which aids in the decomposition of dead oaks. When scratched or bruised, this species will "bleed" or stain red. Young, fresh specimens may exude red juice droplets without any human interference - a beautiful mycological phenomenon known as guttation. Without the red staining, this species is virtually indistinguishable from the false turkey tail (S. hirsutum). S. sanguinolentum is a similar "bleeding" shelf fungus, but it grows on conifers.


Bleeding oak crust (Stereum gausapatum), young, fresh specimen with red juice drops (guttation). Mount Tamalpais State Park, Marin County, California, USA.
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Bleeding oak crust (Stereum gausapatum) with red juice drops (guttation). Mount Tamalpais State Park, Marin County, California, USA.
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Bleeding oak crust (Stereum gausapatum) with red juice drops (guttation). Mount Tamalpais State Park, Marin County, California, USA.
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Next: False turkey tail (Stereum hirsutum)



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All images copyright Timothy Boomer. All rights reserved worldwide.