These are growing on a dead deciduous.. maybe a cottonwood. I included pic of live version of this trees leaves. It is basically white, which is why I think Pleurocybella porrigens. Is there a way, besides with a microscope to tell if this is an angel wing or oyster?

[admin – Sat Aug 14 02:06:57 +0000 2010]: Changed location name from ‘Tryon Creek State Park, Portland, OR’ to ‘Tryon Creek State Park, Portland, Oregon, USA’


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76% (2)
Recognized by sight: Six to eight inches across removes Pleurocybella porrigens from the possibilties. While they may have been transluscent as old and bug eaten, the stipe is too thick for Pleurocybella. P. ostreatus and P. columbianum are the most common locally, with P. ostreatus growing most frequently on alder, maple, and some other local hardwoods. P. columbianum is almost specific to old-growth cottonwood as far as I can tell.

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More details…
By: Aimon (mycophile)
2009-09-09 14:57:56 CDT (-0400)

Some more details:
- They were growing in clumps as seen in pic, every 2 feet or so up the tree.
- The largest ones which had fallen off were 6-8 inches across, very near translucent, mushy and yellowed.
- We had recent rains and this area was very moist and covered in well watered green moss.. so definitely a moist area.

Host is Red alder – Alnus rubra
By: Daniel B. Wheeler (Tuberale)
2009-09-09 09:58:39 CDT (-0400)

And Pleurocybella porrigens certainly grow on that host locally. Haven’t seen anything this early, but in very moist conditions, might be out.

Probably not Pleurocybella
By: walt sturgeon (Mycowalt)
2009-09-08 22:43:45 CDT (-0400)

It grows on conifers and usually fruits in groups and it has very thin flesh.

The shape reminds more of Pleurotus..
By: Irene Andersson (irenea)
2009-09-08 13:45:29 CDT (-0400)

Pleurocybella has more like a vertical growth and is almost translucent.
Pleurotus has somewhat reduced gills closer to the base, in some species anastomosing.

Hmm does Pleurocybella porrigens grow on Desiduous?
By: Aimon (mycophile)
2009-09-08 04:19:25 CDT (-0400)

Hmm does Pleurocybella porrigens grow on Desiduous? If not then this is most likely an oyster mushroom.. But perhaps it will grow on both like oysters??