Observation 13770: Pleurotus ostreatus (Jacq.) P. Kumm.
When: 2008-11-06
No herbarium specimen

Proposed Names

-57% (1)
Used references: I think these are the same as 13183:
92% (2)
Eye3 Eyes3
Recognized by sight: Note the decurrent gills which does not fit Hypsizygus. It may be another species of Pleurotus.
29% (1)
Recognized by sight: The drawing on page 31 shows an oyster mushroom with reticulate gills.
Used references: Else and Hans Hvass. “Mushrooms and Toadstools” New York: Hippocrene Books, 1973.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Cross-hatching of gills?
By: Daniel B. Wheeler (Tuberale)
2008-11-17 01:23:11 AST (-0400)

I’ve never seen that before in P. ostreatus I’ve grown.

MycoWalt called it
By: Dan Molter (shroomydan)
2008-11-15 12:54:33 AST (-0400)

The whiteish immature specimens fooled me. Thinking that MycoWalt might have been be right, I went back yesterday to check on their development. The mushrooms had turned brown and pliable. As the new photos indicate, these are clearly Pleurotus ostreatus.

defining character
By: Dan Molter (shroomydan)
2008-11-07 17:09:01 AST (-0400)

I’m not sure what officially differentiates Hypsizygus, or where it is placed in contemporary cladistic schemes. Arora doesn’t say anything about it, and Mushrooms Demystified is about as deep into the literature as I usually look. I’d rather be hunting mushrooms Haha!

Compared to Pleurotus, these always have a central stem, and the flesh is more brittle. When I first found one, I thought it might be an arboreal Russula, because the stem snapped cleanly like chalk.

The decurrent reticulating gills distinguish this collection from others posted here recently. It’s a pretty strong contrast to the notched gills of observation 13183.

Oooh, nice
By: Douglas Smith (douglas)
2008-11-07 08:45:09 AST (-0400)

Neat guys, I forget, what is the defining character for this genus again?

Created: 2008-11-06 20:49:32 AST (-0400)
Last modified: 2011-08-29 15:59:09 AST (-0400)
Viewed: 186 times, last viewed: 2016-10-27 11:10:57 AST (-0400)