Observation 115660: Paxillus involutus (Batsch) Fr.

When: 2012-11-03

Collection location: Ventura Park, Portland, Multnomah Co., Oregon, USA [Click for map]

Who: Daniel B. Wheeler (Tuberale)

No specimen available

Even though I’ve grown Paxillus involutus with birch in my front yard, I’m only willing to say P. involutus group. It has all the obvious indications of P. involutus. But this obs. was found with Gingko biloba: a tree known from Oregon fossils in the John Day formation, but only recently re-found growing in China, along with Metasequoia. And even more recently reintroduced back to Oregon. Have included a photo of the tree foliage to prove relationship.


1 fallen Gingko biloba laf above Paxillus involutus. Two other leaves from a nearby Tulip tree poplar growing nearby.
Close up of the gill-like structures within the gills, fairly common in Paxillus. Not dark reddish stain on gills in background.
dark reddish stains of bruised cap edge.
Gingko biloba trunk within 3 feet of obs.
Close-up of cap, showing tooth marks from squirrel, I believe.

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Obs. now dried.
By: Daniel B. Wheeler (Tuberale)
2012-11-12 16:31:06 -05 (-0500)

As dried, material seems to be perhaps different than P. involutus. Fresh material had a glutinous cap, similar to Gomphidius. As material dried, became more and more dark red-brown. As dried material is ruby-red: cap, flesh, gills, stipe.

Arora notes a possibility of 2 species: one associated with birch that fruits in the fall; another associated with oak and pine, larger, that fruits in late fall or winter, at least in California.

Created: 2012-11-04 01:48:34 -05 (-0500)
Last modified: 2015-07-24 15:44:07 -05 (-0500)
Viewed: 21 times, last viewed: 2017-06-14 08:44:04 -05 (-0500)
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