Observation 117317: Rhizopogon Fr. & Nordholm
When: 2012-11-19
No herbarium specimen

Notes: Growing on ground under Red Pine in an area where Trocholoma hunters were moving pine needles and mushroom “humps”. It looked like a small potatoe that was cut just below ground. Taste was slightly bitter. the outer surface had a few discernible redish spots(if you looked close). Cut in half it had a whitish interior.

Proposed Names

56% (1)
Recognized by sight: External rhizomorphs; gleba with locules.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Phil (gunchky)
2013-04-03 10:37:49 PDT (-0700)

Dan. I’m looking forward to what the results may be.

Submitted to Dr. Peter Kennedy
By: Daniel B. Wheeler (Tuberale)
2013-04-02 18:50:42 PDT (-0700)

of Lewis & Clark College. Peter tells me he will start work on molecular analysis as soon as he gets it.

More info, Phil?
By: Daniel B. Wheeler (Tuberale)
2012-12-15 21:18:05 PST (-0800)

Do you remember the original collection being tacky or sticky on the cut surface? Did you see any gel-like material in or on the sporocarp?

Both Rhizopogon and Alpova have spores similar in size. Alpova has a matrix (gleba) composed of gel-filled chambers, with spores embedded in that gel. Rhizopogon has dry chambers (small pockets) that sometimes have powdery spore deposits inside them, but contain no gel.

By: Daniel B. Wheeler (Tuberale)
2012-12-13 21:19:31 PST (-0800)

colors include white, cream, olive, olive-yellow, and red.

Collection received, Phil.
By: Daniel B. Wheeler (Tuberale)
2012-12-13 19:15:41 PST (-0800)

Rhizopogon confirmed. Received too late to take pics today, but will post more.

I can confirm Rhizopogon.
By: Daniel B. Wheeler (Tuberale)
2012-11-19 22:22:47 PST (-0800)

Specimen has locules on exposed area near the peridium. Photo not in focus enough for me to give approximate sizes to the locules. There are rhizomorphs on the outside of the peridium. They do not appear to my eye to be red like R. rubescens. Rather, they appear greenish-yellow or greenish-brown for the most part. There is an area of the sectioned sporocarp which showed reddish inside the gleba. But true R. rubescens would have red-staining rhizomorphs on the outside of the peridium wherever the sporocarp had been handled.

I’m afraid that without the sporocarp itself not much else can be determined. Pennsylvania is not noted for abundant collections of Rhizopogon. And it would be necessary to examine the spores to give any better names to this obs.

By: goatshoes
2012-11-19 17:57:13 PST (-0800)

Very cool find!

Created: 2012-11-19 17:46:06 PST (-0800)
Last modified: 2012-12-13 21:17:05 PST (-0800)
Viewed: 105 times, last viewed: 2016-10-23 18:00:20 PDT (-0700)
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