Argentina: home of Bavarian lager

those who don't read articles are doomed to what?

Pastorianus is a hybrid. Some of its genes are known to come from cerevisiae, some from an unknown parent. Eubayanus is an exceedingly close match with those genes of unknown source.

Patagonian natives used the galls containing eubayanus to make a kind of beer.

Eubayanus already seems to enjoy a widespread and will established niche in the patagonian ecosystem.

It has been carefully studied by people who actually know about yeasts and genetics. Admittedly, they aren't Omnicapable Internet Forum Dwellers, but you know, I think they might know their stuff.

None of these things point to it being a recent invasive species.

Now now!

All those Ivy League domineerers will tell you that Europeans got here in 1620! Do no doubt them! They've cut me down when I mentioned my ancestors being in Jamestown, VA, in 1618 ...

But you make a good point. There was at least one German among the Vikings in Greenland and/or Vinland. There is some evidence that the English were fishing off Cape Cod well before Jamestown was founded. So could be.

(Obvious icon, I hope.)

1421 was the year ...

... but although the book is an entertaining read it is regarded by most serious historians as a load of nonsense.