Observation 107264: Strobilomyces confusus Singer
When: 2012-08-27
No herbarium specimen

Notes: Two separate fruitings in the same location on sandy soils near Clear Creek, beside Hemlock, Wild Cherry, and Poplar. The lighter-colored specimens were growing on a rotten stump -not sure what kind of stump

They provided excellent spore prints, so got a chance to look at spores of a few of the specimens at 1000×.

The spores have a reticulum that is almost always incomplete. Therefore, I conclude this is S. confusus and not S. strobilaceus

S. confusus and S. strobilaceus have been collected on our property and on various locations of the Cumberland Plateau in the past. I have tried to learn to tell them apart macroscopically, but to no avail. The only way I can tell for sure is to get a spore print and carefully observe several spores with an oil immersion lens. Since I’ve seen the complete reticulation on the spores of S. strobilaceus in the past, I can tell the difference. It can be tricky, though, as some (pretty low %) of the spores of S. confusus will appear to have a complete reticulumm, more or less. Once the S. strobilaceus spores have been compared, however, the difference is obvious.

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There is a single feature I notice in your obs. photos, Steve.
By: Daniel B. Wheeler (Tuberale)
2012-08-27 15:43:59 MDT (-0600)

Apparently your collection of S. confusus is ever-so-slightly larger where the annulus was attached to the stipe. S. floccopus does not appear to have this subtle swelling.

spore pictures
By: Steve Roberts (Mushroom World)
2012-08-27 13:04:25 MDT (-0600)

You can see pictures of spores here:


and here:


It’s really hard to tell with a picture, as to see the reticulation, it’s important to focus in and out on various spores. If I could get a good comparison with pics, I’d take them and send along, but my camera work with the microscope is somewhat primitive and doesn’t really do the justice it deserves.


By: Douglas Smith (douglas)
2012-08-27 12:50:07 MDT (-0600)

Do you have photos of the spores here? I would like to be able to see the obvious difference. Since I live in California, I’ve only found Strobilomyces once. But I looked at the spores, and I found it rather random with reticulation of the spores, nothing was really clear there. If the difference is obvious, it would be good to see it better documented.

Created: 2012-08-27 12:34:14 MDT (-0600)
Last modified: 2012-08-27 14:03:53 MDT (-0600)
Viewed: 71 times, last viewed: 2016-10-25 20:58:18 MDT (-0600)
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