Observation 81728: Rhizopogon vinicolor A.H. Sm.

found under the large Ponderosa Pine on Chinquapin rd en route to marshall field. There were MANY, most of them not visible under needles. no real smell (well, pine…but that was probably the needles around) and no distinct taste.

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Proposed Names

28% (1)
Recognized by sight: gleba appears a bit pale for that species, although the vinaceous peridium and yellow color does fit. pine host (should be Doug fir) is wrong for that species, too.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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By: zack mikalonis (zackm)
2011-11-11 15:15:33 CDT (-0400)

there are dug firs and other trees in the area, although the mushrooms are appearing very much under the ponderosa (still easily within 40 ft of other trees though). I remember it being spongy.
Christian: I dont think i will make it to the dye workshop today (it has already started correct?) and it sounds like you may have already hiked up there this morning.

Otherwise I will be in that area either later today or monday and can take a sample and examine it more closely for the characteristics everyone has described and grab a herbarium specimen.

Thanks for the input!!!

There’s doug-fir in the area
By: Christian (Christian Schwarz)
2011-11-11 13:12:01 CDT (-0400)
save some for Matt Trappe…
By: Debbie Viess (amanitarita)
2011-11-11 12:06:20 CDT (-0400)

he’ll be speaking at the FFSC meeting next week.

good to know.
By: Debbie Viess (amanitarita)
2011-11-11 11:59:43 CDT (-0400)

must be related to that “rubbery gleba!”

still, a truffle that bounces and has a uniform, solid context like this one is a Rhizopogon.

If you bounce Hysterangium
By: Daniel B. Wheeler (Tuberale)
2011-11-11 11:54:29 CDT (-0400)

you’ll lose ’em. Although solid, they bounce like a superball.

I’m thinking the top-most in the second photo may be insect- or animal-predated. If so that yellowish-orange color may be representative of mature gleba. Very striking, actually.

just give it the bounce test, Zack…
By: Debbie Viess (amanitarita)
2011-11-11 11:22:03 CDT (-0400)

only Rhizopogons bounce when you drop them.

Looks like Rhizopogon to me
By: Christian (Christian Schwarz)
2011-11-11 02:29:12 CDT (-0400)

Zack – if you come to the dye workshop tomorrow, bring some along, otherwise I’ll run up to the tree and grab some of these to put under the scope.

There is something about the gleba that bothers me a little, Zack.
By: Daniel B. Wheeler (Tuberale)
2011-11-11 00:40:04 CDT (-0400)

When cutting it open, did you notice it was slightly spongy, porous or chambered? Rhizopogons are kind of like a Boletaceae without the stipe or cap. By growing underground, it is less dependent on water for fruiting, but must produce a pleasant aroma for animals or insects, which can dig down to them and consume a portion of them, which then move away and perhaps deposit the spores in an area where the spores may germinate and grow into another mushroom. As such, the fungus is dependent upon animals, trees, plant, shrubs, and insects.

The cross-section of the last photo concerns me slightly. When I blow it up as large as possible, I don’t see as many openings (chambers, or locules) as I would expect to see. The fungi are immature, which makes identification, especially of Rhizopogons, more difficult. A mature specimen with some color inside the sporocarp can make a world of difference in trying to identify it.

Hypogeous mycorrhizae are especially common among the Pinaceae, which can survive with relatively scant amounts of water. Once their host plant has been supersaturated with water, the fungus may suddenly produce copious sporocarps, sometimes in as little as 2-3 days after a good rain, which in turn may be mature within a week.

A hypogeous fungi which does not get eaten by something cannot spread further, because the spores are located on the inside of the sporocarp, and are never exposed to air.

While there are exterior rhizomorphs on the fungi in the first and second photos, in many species of Rhizopogon these rhizomorphs are so dense and matted they can form something near a peridium or shell on the outside of the sporocarp. I’m not seeing enough peridium to be certain in this case. That doesn’t mean it would not develop shortly, just that it seems very immature to my eye at this point.

no scope
By: zack mikalonis (zackm)
2011-11-10 22:56:21 CDT (-0400)

I have never preformed microscopy myself. I do not have a microscope but i might be able to get access to one. I will look into getting trained on microscopy so i can be more helpful in the future!

I would suspect Rhizopogon roseolus
By: Daniel B. Wheeler (Tuberale)
2011-11-10 18:40:49 CDT (-0400)

Any microscopy? Any spores mature yet?

Created: 2011-11-08 18:58:53 CDT (-0400)
Last modified: 2011-11-11 12:06:29 CDT (-0400)
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