Observation 217717: Pisolithus Alb. & Schwein.
When: 2015-10-04
No herbarium specimen

Notes: This was lodged in mulch after rain. I’m not sure if it is even fungi, though it appears to have a stalk and looked to me like one until I broke it open. Could be anything though. Anyone seen anything like this?? Now I’m really curious.

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The fact you are aware of these relationships, Jennifer,
By: Daniel B. Wheeler (Tuberale)
2015-10-11 16:36:27 CDT (-0400)

is more than when I started looking at fungus. My grandfather was a greengrocer, going around to farms in the Willamette Valley with a produce wagon. He told the grandkids (me) that we should never under any circumstances eat those terrible mushrooms that were just starting to appear on grocery shelves in the 1960’s.

I wanted to know why…which led to my learning about trees and mycorrhizal fungi.

Don’t apologize, Jennifer. You’re probably further along than I was. And I bet your grandparents don’t worry about the mushrooms you buy in a store.

Thanks everyone!
By: Jennifer (jabdo)
2015-10-11 11:01:35 CDT (-0400)

I’m new to this, trying to learn all I can . Sorry if I seemed dense or frustrating to anyone. Where the different species grow, tree associations,etc have grabbed my attention lately. Plus I haven’t noticed Pisolithus before. Lots of things to look into!

For Jennifer
By: Daniel B. Wheeler (Tuberale)
2015-10-10 00:31:01 CDT (-0400)

not you, Sarah.

The fact that this observation was in mulch has nothing to do with whether it is mycorrhizal or saprophytic. It is mycorrhizal, so the mulch was acting as a casing to hold in moisture. In certain circumstances, cat litter could also be considered a casing mixture. Other casings include: peat moss, vermiculite, moss, leaf litter, chipped wood, etc.

Confused…
By: Sarah Prentice
2015-10-09 19:55:07 CDT (-0400)

Daniel, was your last comment directed at Jennifer or me?

Great info in any case.

Pisolithus
By: Daniel B. Wheeler (Tuberale)
2015-10-09 18:48:19 CDT (-0400)

is a mycorrhizal species, Sarah. Mycorrhizal means it must have a live host tree nearby (but not all that close). Mycorrhizal fungi are associated with tree roots, and rootlets, bur the mycelium (the fungal part) can exist quite aways away from where the fungus attaches to the tree root. There are many good examples of mycorrhizae present on the web, I urge you to seek some out by yourself. Anything I might say would seem impossible to you.

I will leave you with a thought, though. A member of the North American Truffling Society once found a mycorrhizal Tuber gibbosum in the midst of a plowed field, with a single Douglas-fir about 150 feet away. The fir was about 75 feet tall. Mycorrhizae can easily travel much further than twice the height of their host tree, forming an immense mycorrhizal support system which gifts the host tree water, nutrients, minerals; and even detoxifies soils.

mulch
By: Jennifer (jabdo)
2015-10-09 17:24:38 CDT (-0400)

So I don’t know what all’s in the mulch it was in, the nearest tree was definitely a maple, but there are oaks in the vicinity.

If true
By: Daniel B. Wheeler (Tuberale)
2015-10-05 20:25:12 CDT (-0400)

that’s a first for Pisolithus, Jennifer. Pisolithus is often found associated with 36 known species of tree, but none of them (that I know of) is a maple. Could the tree have been an oak, perhaps?

Great observation of
By: Jacob Kalichman (Pulk)
2015-10-05 19:51:23 CDT (-0400)

tearing vs. slicing. Yes, slicing does mix up areas of tissue causing staining. When I was posting really detailed Pisolithus obses I described both types of cross sections.

tree
By: Jennifer (jabdo)
2015-10-05 19:06:59 CDT (-0400)

The nearest tree is a maple of some sort.

And good point- I did have to tear the specimen as I didn’t have my knife with me. That will be interesting to try if I see another.

Could the peridiole whiteness
By: Sarah Prentice
2015-10-05 18:37:18 CDT (-0400)

have anything to do with tearing rather than slicing?

The one time I found Pisolithus, slicing it cleanly in half seemed to stain the peridioles yellow-brown (image 545075). I squeezed one half and the “juice” was brown like iodine and lightly stained my fingers.

When I tore a half into quarters, the peridioles looked much lighter (image 545076).

Of course this is amateur speculation.

Has a pseudostipe,
By: Daniel B. Wheeler (Tuberale)
2015-10-05 13:26:59 CDT (-0400)

peridium and gleba containing peridioles. In your case, the peridioles are the interesting part, to me. I have never seen Pisolithus with white peridioles before, but this is a beautiful example of that. Would love to know any nearby tree species.

Pisolithus are mycorrhizal
By: Jacob Kalichman (Pulk)
2015-10-04 19:28:21 CDT (-0400)

So a nearby tree was probably doing more work than the kitty litter ;)

Nice find, Jennifer!
By: Sarah Prentice
2015-10-04 17:16:28 CDT (-0400)

I once observed Pisolithus growing on a pile of discarded kitty litter.

Created: 2015-10-04 16:56:04 CDT (-0400)
Last modified: 2015-10-05 13:24:57 CDT (-0400)
Viewed: 112 times, last viewed: 2016-10-23 23:47:19 CDT (-0400)
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