Observation 223270: Suillus Gray
When: 2015-11-17
No herbarium specimen

Notes: Half a dozen specimens popped up overnight (after an inch and a half of rain) in grass beneath an Eastern White Pine in suburban residential lawn. Slimy, sticky caps, glandular dots on stipe. Pale yellow flesh. Ammonia red and KOH black on both cap and flesh. Obtained cinnamon-brown spore print.


Copyright © 2015 Judi Thomas
Copyright © 2015 Judi Thomas
(A) Same as original posting with perhaps fresher/lighter glandular dots.
(A) Same as original posting with perhaps fresher/lighter glandular dots.
Copyright © 2015 Judi Thomas
(B) Longer, leaner stipe. Cap and stipe differently colored. Note red bruising on cap where damaged/bruised.
Copyright © 2015 Judi Thomas
(B) Longer, leaner stipe. Cap and stipe differently colored. Note red bruising on cap where damaged/bruised.

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Recognized by sight
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Recognized by sight

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Add Comment
Dave, I’m going to remove the photos of the
By: Judi T. (AvidAmateur)
2015-11-19 20:11:46 EST (-0500)

specimen with the darker cap and stipe ornamentation. That way I will be confident of the Suillus ID; and I’m okay with leaving it at the genus level. I will revisit the site over the next few days to see if I can find another specimen of the darker one if, indeed, it was not simply a fluke of the very wet weather. If I find more, I’ll post them separately later. Thanks for all your input.

I think the top and bottom photos…
By: Dave W (Dave W)
2015-11-18 22:09:24 EST (-0500)

may be the same species. Middle photos (species B) looks different. I’d say all of the mushroom pictured here belong to genus Suillus.

P.S. No evidence of partial veil on any of the specimens.
By: Judi T. (AvidAmateur)
2015-11-18 15:17:54 EST (-0500)
Dave, thanks for your answers. The more I look at these
By: Judi T. (AvidAmateur)
2015-11-18 15:13:15 EST (-0500)

the more I think it is 3 different species. I’ve never seen that before, i.e., growing in such close proximity to each other and all, apparently, within the Bolete genera and species. Would you describe the stipe in collection C as a scaber stipe rather than glandular dots? Is there a descriptive term for the rather lumpy or uneven pore surface of that specimen, as well. I think I’ve seen that at some time in the past but can’t remember where or what it is called. I guess I’ll go ahead with all the usual measurements and tests then, treating these as 3 separate species and follow your advice to separate them if/when someone calls my ob. a mixed collection,w hich it really is at this point, I think. THNX again, Dave.

Judi, I think there are…
By: Dave W (Dave W)
2015-11-18 14:07:13 EST (-0500)

two (possibly three) species here. Photos labeled B appear to show a different species from either the top or bottom photos. The longer whiter stipe on B appears to lack well defined glandular dots, and instead seems to have patchy pale yellowish deposits.

One thing that just occurred to me is that the glandular dots seen on top and bottom specimens may appear darker than they should as a result of the stipe having been partly buried in the ground, and the rain/soil combining to darken them… just an idea.

Did any of the ones you examined show any signs of a partial veil?

I don’t think any of the specimens pictured represent S. americanus, which is a fairly distinctive easily-recognized species.

As for separate posts… maybe wait and see if anyone has any strong recommendations about this being a mixed collection. If so, the if you post separately you may link them together within the notes.

David and Jacob: Thank you both for looking at my ob. You know how much
By: Judi T. (AvidAmateur)
2015-11-18 13:29:34 EST (-0500)

I always appreciate your expertise and help. I admit the photos in this ob look more like S. brevipes but I couldn’t/can’t reconcile the fact that the macrochemical reactions don’t fit that species. After re-reading all of the Suillus descriptions in Bessette’s “North American Boletes” last night, I decided to revisit the site this morning (after yet another inch of rain overnight). Now I am more uncertain than ever about an accurate ID.

This morning I collected 10 more specimens in that area. To my eye, there appear to be 3 different species in this one (approximately) 8 X 8’ area within the root zone of this mature Eastern White Pine. I will add photos of (A) 2 more pictures of what looks like my original post, (B) specimens that look similar but have a longer, leaner stipe and a differently colored cap, and © a species that looks entirely different.

My questions to you both are (1) is it possible to have 3 different mycorrhizal species living with one host?, (2) Should I delete my original ob and post 3 separate ones?, or (3) post 2 separate obs. if you think A and B are the same species?

If you think it would be productive, I will do some more chemical tests and try for spore prints again.

Thanks again for your opinions and advice.

Cap color is wrong for S. americanus.
By: Dave W (Dave W)
2015-11-17 23:36:50 EST (-0500)

Also, newly emerged S. americanus should show appendiculate partial veil material material along the cap margin. The stipe is short and stocky for americanus.

Except for the glandular dots on the stipe, this reminds me of S. brevipes. Also looks like S. granulatus, except the dots on the stipe should be lighter in color for this species.

Created: 2015-11-17 20:38:07 EST (-0500)
Last modified: 2015-11-19 20:14:57 EST (-0500)
Viewed: 119 times, last viewed: 2017-06-21 05:13:07 EDT (-0400)
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