When: 2011-10-20

Collection location: Shorecrest High School, Shoreline, King Co., Washington, USA [Click for map]

Who: Tim Sage (NMNR)

No specimen available

Species Lists


Proposed Names

57% (1)
Recognized by sight

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Add Comment
By: Daniel B. Wheeler (Tuberale)
2011-10-22 07:34:50 CEST (+0200)

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 (NMNR)
2011-10-22 06:27:27 CEST (+0200)

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)
2011-10-22 05:30:14 CEST (+0200)

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)
2011-10-22 03:50:52 CEST (+0200)

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

Not near birch….
By: Tim Sage (NMNR)
2011-10-22 01:31:18 CEST (+0200)

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)
2011-10-22 00:18:50 CEST (+0200)

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