Alan Rockefeller said:

This morning I got some new DNA sequencing results back which finally solve the taxonomic mystery around these species.

In May someone found Psilocybe tampanensis in Florida, the first time it's been found there since it was discovered in 1977.  The sequence matches perfectly with a wild P. atlantis collection that I sequenced a month ago, putting into place the last piece needed to solve this puzzle.

I now have quite a few sequences from this group, and they all fall into two groups - The USA ones all match, and are 5 bases different from the Mexican sequences which also all match.

Both species are common in truffle cultivation, with P. atlantis forming much larger sclerotia than P. mexicana.

The caps look different - P. atlantis is lighter in color and more convex, while P. mexicana is darker, more striate and more campanulate.

Since P. tampanensis was published in 1978 and P. atlantis in 2003, the correct name for the southeastern P. mexicana-like species with large sclerotia is P. tampanensis. 

Psilocybe galindoi is a synonym of P. mexicana, however what is being cultivated under the name P. galindoi is P. tampanensis.  P. mexicana/A is also probably P. tampanensis, while the Jalisco strain really did come from Jalisco and is P. mexicana.

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Svetaketu said:

I'm really just asking questions here too, I'm not 100% on how this all works.

But as I understand it, DNA testing doesn't test the entire genome of the mushroom, it only tests relevant pieces of the code that will give us an idea of how simmilar the mushrooms are.

So based on my understanding, the DNA testing they did would tell us PE is genetically identical to every other cubensis.

I'm not sure what the implication of a "5 base pair" difference is, but Mexicanae appear to be very macroscopically different from Tampanensis, for reference;

This is Ps. Tampanensis;


And this is Ps. Mexicana Chico Nindo;

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i don't know any more than anyone else, of course. but check the journal linked in my sig. these came from a print claimed to be galindoi. based on everything i've read and heard, i've concluded these are mexicana. compared to the above fotos, they certainly resemble the mexicana more closely.
 
doesn't look like tamps to me.

so the question is, how does an amateur positively id galindoi? can anyone share pictures known to be galindoi?