Okay guys..... I spent a good 3 or 4 hours staring at all the genome data, and here's what I *think* I've figured out:
The original link contains 3 places on the tree for "WLP019/WLP051/WY1056". I do NOT take this to mean that these 3 yeasts are identical! Far from it! I think they just weren't sure which one went where. 3 yeasts, 3 slots. More sleuthing will be needed to figure which one goes where. And I think I've figured it out, maybe. My thoughts:
As I just said, to be clear, WLP051 and Wyeast 1056 are NOT equivalent. They are very very distant cousins.
BRY-96 = Wyeast 1056, AND NOTHING ELSE! NOTHING else is exactly equivalent! 1056 is unique!
BRY-97 = WLP051 = 1272, AND NOTHING ELSE! Nothing else is exactly equivalent! And if I'm right in my interpretation as explained above, then all 3 of these might be pastorianus, including 1272 and the dry version!(?)
WLP001 and WLP051 are close sisters or cousins, both from one origin (in the 1950s or whatever), which presumably is Ballantine, which might actually be Uncle WLP019 which is a relatively old strain.
BRY-97 = WLP051 = 1272 didn't have any babies yet, if I'm right. This branch of the tree is unique. And even if BRY-97, WLP051, and 1272 aren't exactly the same, they should be really close. The family tree isn't clear enough and really only spelled out White Labs strains clearly, and very few dry yeasts, but not Wyeast ones, so this is a bit of a guess.
Wyeast 1056 is on a completely separate branch from all others, and US-05 is a very distant descendant of 1056. These two strains actually aren't super closely related to any of the others discussed above, or even to each other.
1056 and US-05 *might* be lagers, but I have never seen evidence in that regard on suregork's site or other sources. However... if I were a betting man, I *might* be willing to bet a 6-pack that they are pastorianus, maybe. If that's the case...
It's possible that maybe ALL of these are pastorianus?! But I am not savvy enough to figure that out yet. I haven't bothered yet to look whether each of these were "confirmed to definitely be cerevisiae". If they were, then the pastorianus *might* indeed be limited to just BRY-97 = WLP051 = 1272. I really don't know where the mutation from c. to p. event occurred. Could be a good question for suregork & qq if we can't find it ourselves.
I'm tired, I'm going to bed. Curious to think if you all find this to make any sense, or not, or what. Talk to you later.