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Oyster Mushroom (Pleurotus ostreatus Group)

The oyster mushroom (Pleurotus ostreatus group) is recognized for its shelf-like composition, where it forms clusters which emerge laterally from decaying wood (usually hardwoods, but occasionally conifers). The caps range in color from white to grayish buff and are often thought to resemble oysters — hence the common name and scientific epithet. Oyster mushrooms are considered choice edibles, and are a favorite among many mycophagists (mushroom eaters). [Note: This group includes multiple species which can be challenging to differentiate without DNA sequencing. It is my understanding that mycologist Alan Rockefeller determinted that there are no true P. ostreatus mushrooms in California. The following are therefore likely to be Pleurotus pulmonarius.]


Oyster mushroom (Pleurotus ostreatus group, likely Pleurotus pulmonarius). Wide-angle macro taken from ground level. Focus-stacked composite. Kruse Rhododendron State Natural Reserve, Sonoma County, California, USA.
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Oyster mushroom (Pleurotus ostreatus group, likely Pleurotus pulmonarius), low-angle view of young, fresh fruiting bodies. Mount Tamalpais State Park, Marin County, California, USA.
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Oyster mushroom (Pleurotus ostreatus group, likely Pleurotus pulmonarius), horizontal composition. Mount Tamalpais State Park, Marin County, California, USA.
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Oyster mushroom (Pleurotus ostreatus group, likely Pleurotus pulmonarius), overhead view. Mount Tamalpais State Park, Marin County, California, USA.
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Next: Gilled polypore (Trametes betulina)



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All images copyright Timothy Boomer. All rights reserved worldwide.