Observation 215055: Pisolithus Alb. & Schwein.

When: 2015-09-01

Collection location: Senate Way, Cupertino, California, USA [Click for map]

Who: Sava Krstic (sava)

No specimen available

Growing under a small tree that I still need to identify. Concrete and asphalt all around; the nearest large trees are a tanoak and Jeffrey pine, about 10 m away.

Proposed Names

73% (3)
Recognized by sight
Used references: MO observations

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Sava Krstic (sava)
2015-09-04 22:49:35 PDT (-0700)

The pines in the background are 25 m from the collection site. In another direction, at half that distance, there is another pine; and in the third direction, 10-15 m away, there are a few tanoaks.

Thanks for the discussion. I’m particularly glad I learned this laurel tree.

Pine in background
By: Daniel B. Wheeler (Tuberale)
2015-09-04 13:14:59 PDT (-0700)

definately within range, especially when most of the surface has been paved. I’d guess the pine is 120 feet away, and at least 70 feet tall. But pine mycorrhizae are known to extend much further than this. Still good to see proof, Sava.

Laurus nobilis
By: Christian (Christian Schwarz)
2015-09-04 12:48:21 PDT (-0700)

True Bay-laurel, yes an ECM host, and a neat one to see (potentially) for Pisolithus in CA.
But I think Pulk may be correct in suspecting that the pine in the distance might still be within root-range for this fungus.


Might consider the pine in the far background, just to be safe?
By: Jacob Kalichman (Pulk)
2015-09-04 12:12:27 PDT (-0700)
With laurel
By: Daniel B. Wheeler (Tuberale)
2015-09-04 11:59:04 PDT (-0700)

then, which is also associated with many mycorrhizal species. But mostly northern distritribution.

The tree
By: Sava Krstic (sava)
2015-09-04 00:00:37 PDT (-0700)

… under which I found the Pisolithus is in the two pictures I just added. My guess is that the tree is some kind of laurel. The leaves are aromatic, but so are the leaves of eucaliptus trees.

I should add that I’ve seen more Pisolithus about 200 m from home (where these are found), which were definitely under pines.

I wasn’t saying that a Eucalyptus host wouldn’t cast doubt on P. arhizus…
By: Jacob Kalichman (Pulk)
2015-09-02 18:22:12 PDT (-0700)

just, I’ll eat my hat if the host is Eucalyptus.

Ochre vs. chocolate spores
By: Daniel B. Wheeler (Tuberale)
2015-09-02 16:31:56 PDT (-0700)

Host still a primary characteristic, Jacob. Sava sid he was unable to identify the tree closest to this observation. If it turns out the host is tanoak or Jeffrey pine, I will change my vote to agree with Sava.

Spore color
By: Jacob Kalichman (Pulk)
2015-09-02 11:52:13 PDT (-0700)

I’ve seen a 100% correlation of ochre spores with Eucalyptus vs chocolate spores (as pictured) with other trees. I would be very surprised/intrigued if this were with Eucalyptus.

Whil may be P. arhizus
By: Daniel B. Wheeler (Tuberale)
2015-09-02 11:33:34 PDT (-0700)

in CA could e associated with eucalyptus, which means a different kind of Pisolithus, Sava. Need to know what tree this obs. was found with.

Created: 2015-09-01 22:49:30 PDT (-0700)
Last modified: 2015-11-10 13:47:04 PST (-0800)
Viewed: 125 times, last viewed: 2017-09-05 16:00:33 PDT (-0700)
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