Observation 116669: Amanita phalloides (Vaill. ex Fr.) Link

Found under Oak minutes after Alan Rockefeller’s PSMS presentation.

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Yes, holm oak is common in Europe.
By: Daniel B. Wheeler (Tuberale)
2013-10-03 14:21:04 CDT (-0500)

It is also one of the species most affected by Sudden Oak death, and may have been the vector by which Sudden Oak spread into the native population.

CA has nurseries that carry Holm oak. It is relatively easy to grow in a semi-arid environment. Phytophthora is more common in wet environments, which is why it easy spread into southern Oregon. And why efforts are being made to remove it what that disease is likely to crop up in the near future.

By: Christian (Christian Schwarz)
2013-10-03 14:13:00 CDT (-0500)

Holm Oak semi-common in CA but limited by Sudden Oak Death?

This is… not the case. It is a mediterranean (European) tree. The only trees that exist in CA of this species are planted.

Just saw where you posted from, Tim.
By: Daniel B. Wheeler (Tuberale)
2013-10-03 14:12:00 CDT (-0500)

Probably a good place to cut some firewood, unless you like Phytophthora
ramorum. I thought WA was trying to control the spread of that, as is OR.

Washington has record of 3 collections from 2000 in Seattle.
By: Daniel B. Wheeler (Tuberale)
2013-10-03 14:09:08 CDT (-0500)

Definately NOT a common tree in WA. Quercus ilex, AKA holm oak or holly oak, may be semi-common in CA, but is limited in distribution due to the spread of Sudden Oak death via that species. Too wet in WA for viable commnities.

Was the collection near or in Seattle?

Quercus ilex
By: Tim Sage (T. Sage)
2013-10-03 10:49:05 CDT (-0500)

According to Noah Siegel

Not possible.
By: Daniel B. Wheeler (Tuberale)
2012-11-16 13:47:07 CST (-0600)

According to Oregon State University’s website: oregonstate.edu/trees/broadleaf_genera/species/oak_spp.htm

Oregon Live oak (Quercus chrysolep) is found in Southern Oregon and Northern California, typically in dry canyonland areas. Oregon live oak has small evergreen leaves, usually less than 1.5 inches long. I find no record of live oak in Washington. Too wet.

Several people of SE Asian descent were poisoned in SW Washington about 1992 after eating Amanita phalloides. Jan Lindgren checked out the site, and concluded the fungus was growing with chestnut.

Under live oak
By: Tim Sage (T. Sage)
2012-11-16 09:48:22 CST (-0600)
I’m curious if you remember any trees nearby, Tim.
By: Daniel B. Wheeler (Tuberale)
2012-11-16 00:48:39 CST (-0600)

Amanita phalloides is mycorrhizal, and requires a host plant for survival. When it was found several years ago in Vancouver, WA, it was relatively easy to separate this out from other Amanitas based solely on the host: chestnut. It looks like most of the leaves in your photos are oak, though. Especially pin oaks (with points on the oak leaves) that suggest Quercus palustris to me, at least. In Oregon, the only native pin oak is California Black oak (Quercus kellogii) whose range limits it to about Eugene as the farthest northern point that I know of.

Created: 2012-11-14 00:30:32 CST (-0600)
Last modified: 2012-11-14 00:30:34 CST (-0600)
Viewed: 190 times, last viewed: 2018-05-20 09:25:07 CDT (-0500)
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