Observation 80126: Paxillus involutus (Batsch) Fr.
When: 2011-10-20
No herbarium specimen

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By: Daniel B. Wheeler (Tuberale)
2011-10-21 22:34:50 PDT (-0700)

About the only thing I find P. involutus with is birch. In fact, when I am looking for this species, I zero in on birch, especially our native Water birch, which can sometimes be found along the Columbia River.

BTW, be on the lookout for Tuber species with Tilia: there is a species which can be found from now through early May, and seems to be resistant to freezes as well.

No Birch….
By: Tim Sage (T. Sage)
2011-10-21 21:27:27 PDT (-0700)

Not within sight. I have been seeing them fruit under trees they normally don’t fruit under this year, while the Birches I have seen them under in the past right now have none.

This observation was under Tilia, with no Birch in sight as well:


Basswood (Tilia sps.)
By: Daniel B. Wheeler (Tuberale)
2011-10-21 20:30:14 PDT (-0700)

is a common ornamental planting in my area. But I have never found P. involutus associated with it. Rather, I have grown it with seedling birch in my front yard (several years ago), and have collected it many times under a single birch in the courtyard of the Oregon Historical Society Museum.

In my personal experience, it can fruit quite a distance from the host plant. If, for example, a birch tree is 30 feet tall, P. involutus may be fruiting 20 feet distant from it.

By: Noah Siegel (Noah)
2011-10-21 18:50:52 PDT (-0700)

been under a lot of Tilia in Seattle this past week.

Not near birch….
By: Tim Sage (T. Sage)
2011-10-21 16:31:18 PDT (-0700)

But I have been finding many of what seems to be P. involutus under trees other than birch…

Almost certain.
By: Daniel B. Wheeler (Tuberale)
2011-10-21 15:18:50 PDT (-0700)

What tree was growing nearby, Tim? If birch was present, almost guaranteed P. involutus.

Created: 2011-10-20 19:09:02 PDT (-0700)
Last modified: 2011-10-20 19:09:02 PDT (-0700)
Viewed: 79 times, last viewed: 2017-06-09 23:01:56 PDT (-0700)
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