Amazonian.

What's known

Here's what's meant to be true and not.

What we actually know

• The name traces to Pacifica Exotica Spora (PES), a Honolulu spore vendor active from roughly the 1990s into the early 2000s, now defunct, which also put out PES Hawaiian.
• Naming a strain after the company that distributed it was common practice at the time, which is why the PES prefix stuck.
• Genetically it is a plain Psilocybe cubensis, not a hybrid, not a separate species, and not an albino or leucistic strain.
• It drops a dark purple-brown to near-black spore print and deposits heavily, which makes it a clean, high-contrast subject under the microscope.
• It is widely reported to throw large fruitbodies on rope-like rhizomorphic growth, a look collectors recognise on sight.
• As with every cube, lab data shows strain-to-strain strength differences are mostly cultivation-driven. A cube is a cube.

What the community says

• It was collected in the Amazon, variously placed in Brazil, Colombia or Peru, from dung in the rainforest before PES preserved and distributed it. The collection itself is undocumented, so treat it as hearsay.
• One colourful version has it found in a dung patty left by a tapir, already bruised blue. A good tale, and exactly the kind of detail nobody can verify.
• It often gets tangled up with the famous McKenna Amazon collection story, the one usually told about Penis Envy. They are separate stories and should not be assumed to be the same strain.
• The trade can't even agree whether Amazonian and the shorthand PESA are one strain or two. Some old hands say identical, others swear PESA fruits smaller. The question has been open on the forums for years.
• The PES in the name is sometimes wrongly read as a place. It is just the old vendor's initials, Pacifica Exotica Spora.

Where it came from

Most cubensis strains are named after a person, a place, or a quirk of shape. Amazonian is named after a shop. Its full handle is PES Amazonian, and the PES is Pacifica Exotica Spora, a Honolulu spore vendor that by most accounts ran from the 1990s into the early 2000s and helped put cubensis spores into mail-order circulation before quietly closing. The same outfit gave the hobby PES Hawaiian. Sticking the distributor's initials on the front of a strain was just how things were done back then, which is why two unrelated strains can both wear the PES badge.

The Amazon part of the story is where the documentation thins out fast. It is said to have been collected somewhere in the Amazon basin, with vendors variously naming Brazil, Colombia or Peru, from dung on the rainforest floor before PES picked it out and shared it. None of that collection trip is recorded anywhere you can actually check. Psilocybe cubensis genuinely is a pan-tropical dung-lover, so a wild Amazon origin is entirely plausible, but plausible is not the same as proven.

The version is short: a real old vendor, a real widely-shared strain, and an origin story that has been repeated far more often than it has been verified.

What to expect at the scope

Because the word Amazonian is so loaded, this strain keeps getting cross-wired with the other famous Amazon tale, the McKenna brothers and the collection that hobbyists usually credit as the ancestor of Penis Envy. Those are different stories, and even that PE story is now reckoned to be heavily embroidered. The cleaner read is to treat PES Amazonian as its own thing, a sturdy old commercial cubensis, and to keep the legends labelled as legends.