When: 2017-06-17

Collection location: Pride, Louisiana, USA [Click for map]

Who: Logan Wiedenfeld (LoganW)

No specimen available

Growing near river birch, with oak and pine probably in the vicinity. Acrid white latex.



Proposed Names

28% (1)
Recognized by sight
60% (2)
Recognized by sight: Inrolled cap margin
28% (2)
Used references: Field Guide to Southern Mushrooms

Please login to propose your own names and vote on existing names.

= Observer’s choice
= Current consensus


Add Comment
It seems that they are.
By: Derek Ziomber (Space Time Matters)
2017-06-17 18:39:59 PDT (-0700)

At least according to MushroomExpert.com they are synonyms, citing a 2005 paper by Montoya and Bandala. But this paper is based entirely on morphological considerations and not molecular methods, so they could end up being distinct.

Montoya, L., & Bandala, V. M. (2005). Revision of Lactarius from Mexico. Additional new records. Persoonia-Molecular Phylogeny and Evolution of Fungi, 18(4), 471-483.


By: Logan Wiedenfeld (LoganW)
2017-06-17 18:09:23 PDT (-0700)

Are these synonyms?

By: Logan Wiedenfeld (LoganW)
2017-06-17 18:05:01 PDT (-0700)

Derek – You may be right. L. deceptivus seems like a candidate for sure. I think, however, that L tomentoso-marginatus may be a better fit. Weber and Smith note the thick, soft (“almost cottony”) in-rolled cap margins. This was a feature I noticed but interpreted as water damage.

Thanks for your input, in any case. I posted another mystery Lactarius earlier and will do some digging for it in a bit. With the exception of the handful with non-white latex and the other handful with distant gill-spacing, this is a tough genus for me.

It looks like
By: Derek Ziomber (Space Time Matters)
2017-06-17 17:38:56 PDT (-0700)

L. deceptivus to me. The cap looks like it might be becoming scaly and the margin is inrolled. The gills aren’t very crowded. But there are a few similar species. MushroomExpert.com covers these white acrid Lactarius species well.

Did you notice any brown staining to the gills or a color change from white to light green in the latex.

Created: 2017-06-17 13:55:21 PDT (-0700)
Last modified: 2017-06-17 19:22:03 PDT (-0700)
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