Observation 179480: Pisolithus Alb. & Schwein.

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I wouldn’t just yet.
By: Daniel B. Wheeler (Tuberale)
2014-09-23 15:47:00 PDT (-0700)

Pisolithus abditus described from India; P. aurantioscabrosus described from Malaysia; P. capsulifer described from SE Asia; P. croceorrhizus described from Australia; P. hypogaeus described from Australia; P. indicus described from India; P. marmoratus described from New Zealand; P. microcarpus described from Australia; P. orientalis described from Thailand/SE Asia.

Please suggest another species found in North America.

Better go down vote all the Pisolithus arhizus on MO to “doubtful” now….
By: Tim Sage (T. Sage)
2014-09-23 10:51:44 PDT (-0700)
By: Byrain
2014-09-23 07:38:25 PDT (-0700)

The Pisolithus options are numerous and mostly undescribed, Daniel, please don’t spread misinformation, thanks.

By: Daniel B. Wheeler (Tuberale)
2014-09-23 06:34:18 PDT (-0700)

call it that.

I see no reason not to call this P. arhizus
By: Tim Sage (T. Sage)
2014-09-22 22:28:01 PDT (-0700)


You mean in the world?
By: Daniel B. Wheeler (Tuberale)
2014-09-22 14:42:13 PDT (-0700)

P. tinctorius (=P. arrhizus) US and Puerto Rico, Pinaceae; P. indicus from India under Dipterocarpaceae; P. albus from New Caledonia; P boorabiensis, P. mamoratus, P. microcarpus and P. sp. (PL151310) from Australia. Other Pisolithus are from South Africa associated with Acacias.

The oak photos you added are all Quercus palustris, Eastern Red oak. Sometimes called Northern Red oak and Northern Pin oak. They are not native, but have naturalized here. As fast growers, they tend to not twist as Oregon White oak does. Also they have a lot of use as fast-growing oak lumber.

Here in Portland, we have many that were planted as ornamental trees about 50-70 years ago. They have become a major source of food for crows, squirrels, and opposums.

What are some other Pisolithus options?
By: Tim Sage (T. Sage)
2014-09-22 10:03:38 PDT (-0700)
I will take some photos of the oaks shortly
By: Tim Sage (T. Sage)
2014-09-19 10:31:58 PDT (-0700)


By: Daniel B. Wheeler (Tuberale)
2014-09-19 10:20:21 PDT (-0700)

I could take photos and send them to you to compare.

Could you take photos of the 2 oaks?
By: Daniel B. Wheeler (Tuberale)
2014-09-19 10:15:53 PDT (-0700)

I’ll bet I can identify them. While Oregon White oak is the only native oak to the area, this could have Quercus palustris (Eastern Red oak) as an ornamental planting. It grow readily in Oregon, and I have one growing outside by window right now. Eastern Red oak is a type of pin oak, which has pointed lobes to the leaves. Oregom White oak has rounded leaf lobes.

I am poor with trees….
By: Tim Sage (T. Sage)
2014-09-18 21:34:02 PDT (-0700)

But the only ones I saw were what I thought were two different types of oak. I will go look further in the morning.

RE: Pisolithus in WA
By: Daniel B. Wheeler (Tuberale)
2014-09-18 20:50:38 PDT (-0700)

I don’t believe any other the other Pisolithus species have every been found in Washington.

Most of the world’s Pisolithus are restricted to eucalypts and acacias. Oregon White oak as the probably host severely limits possibilities. I know of no eucalypts which will tolerate Washington’s climate for more than a year. Acacias even less.

Only oak I know of in Washington is Quercus garryana, Oregon White oak.
By: Daniel B. Wheeler (Tuberale)
2014-09-18 20:45:17 PDT (-0700)

Huge one next to downtown courthouse in Kelso, WA. I need to collect some of those acorns!

Oak. methinks
By: Tim Sage (T. Sage)
2014-09-18 20:23:09 PDT (-0700)
Nearby trees/shrubs, Tim?
By: Daniel B. Wheeler (Tuberale)
2014-09-18 20:21:05 PDT (-0700)

Pisolithus is mycorrhizal, and requires a host plant. While Pisolithus is widely mycorrhizal (associated with at least 35 hosts), certain inferences can be made if the host is known. Was there any
or other tree or shrub nearby where these specimens were found?

Created: 2014-09-18 19:35:48 PDT (-0700)
Last modified: 2014-09-24 23:37:57 PDT (-0700)
Viewed: 264 times, last viewed: 2017-06-18 19:38:41 PDT (-0700)
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