Observation 58097: Pleurotus ostreatus (Jacq.) P. Kumm.

When: 2010-11-05

Collection location: Canyon, Contra Costa Co., California, USA [Click for map]

Who: Richard Sullivan (enchplant)

No specimen available

Growing on a fallen log



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Eye3 = Observer’s choice
Eyes3 = Current consensus


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I know what you mean
By: Danny Newman (myxomop)
2010-11-08 00:59:10 CST (-0500)

about small oysters; long, extremely decurrent gills, a tightly inrolled margin, and never translucent. Kind of like the back end of a pencil if the eraser were bigger. But in shopping around for P. porrigens primordia pictures, I found some young fruit bodies that had a little of this Pleurotus look to them as well.


MoPNW cites oysters as having thicker flesh and being darker-colored, and goes on to say that P. porrigens

“recently was responsible for the deaths of several elderly Japanese, so caution is in order.”

Ambiguous, unsubstantiated claim of deadly toxicity of a mushroom previously considered food, followed by the understatement of the century, end of entry. Thank you Trudell & Ammirati.

To begin with,
By: Milo (Mycophiliac)
2010-11-08 00:28:02 CST (-0500)

the margin is a lot wavier. As demonstrated in these pictures, the tree oyster can also exhibit this feature, although it is not as common as with Angel’s Wings.

I’m not heavily experienced with the species, but the ones I have seen (as well as pictures) have primordia which mature differently from oysters. Once you’ve seen small oysters, you can recognize them immediately – as in the first, second, and fourth pictures in this observation. I’m sure the gills have something to do with it as well. Microscopy is definitely a good tool for differentiating.

just out of curiosity
By: Danny Newman (myxomop)
2010-11-08 00:18:06 CST (-0500)

what distinguishes this all-white oyster from Pleurocybella porrigens?

Created: 2010-11-05 19:33:01 CST (-0500)
Last modified: 2010-11-05 19:33:05 CST (-0500)
Viewed: 102 times, last viewed: 2018-11-28 14:41:59 CST (-0500)
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