Observation 181825: Pisolithus Alb. & Schwein.
When: 2014-10-06

Notes: Growing from under a decorative rock in a butterfly garden. Surface covered in orange-brown spore dust.



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At the very bottom of these photos
By: Daniel B. Wheeler (Tuberale)
2014-10-12 03:25:30 PDT (-0700)

is where I see the rhizomorphs, Shane. Amidst the white sand, but atop what I call a pseudostem, or false-stem. The peridium is a covering that encloses the entire sporocarp, from base to top. While breaking apart in places, it is still present. Near the bottom half-inch of it is what I see as either a creamy-white, brown-white, or brown fibrous area that I’m especially interested in.

If you go back, please try to collect a whole specimen (includimg this rooted area). That may require digging 2-3 inches away from the actual base. While the rhizomorphs (root-like structures) are tough and fibrous, the will often yield before the pseudostem does. It is these structures that are often pulled or broken off of the sporocarp, that may assist in identification, I think.

At least one other Pisolithus from California has shown bright yellow rhizomorphs already this year. Most have brown or golden-brown fibrous rhizomorphs. This collection may have creamy-white rhizomorphs (I think).

Before revisiting the site, try looking at other Pisolithus on MO collected this year. Most Pisolithus have these fibrous roots, but they are tiny. They may assist in assigning a species name to it. I hope.

I didn’t see any ‘roots’ when I pulled it up, unfortunately
By: Shane Palmer
2014-10-11 21:09:05 PDT (-0700)

I’m still a beginner at this and didn’t think to look for rhizomorphs when I pulled it up. It was sort of wedged under a rock so was a bit difficult to get out in one piece.

The butterfly garden is part of a nature park, so there were lots of oaks. High likelihood that most or all of the nearby plants are natives, since it’s been well managed. I’m going back this week and will take a closer look at the trees and shrubs near the garden.

How would you describe the basal rhizomorphs, Shane?
By: Daniel B. Wheeler (Tuberale)
2014-10-11 19:40:30 PDT (-0700)

(Hint: basal rhizomorphs look like the roots of a plant): creamy-white, maybe?

Also, Pisolithus is mycorrhizal, and currently there is wide discussion on Pisolithus mycorrhizal with native plants and trees vs. non-native plants and trees (i.e. oak vs. eucalypts). What shrubs or trees were growing where this specimen was found?

Created: 2014-10-06 16:17:34 PDT (-0700)
Last modified: 2014-10-12 03:26:17 PDT (-0700)
Viewed: 34 times, last viewed: 2017-06-18 22:21:14 PDT (-0700)
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