daksin said:It's not- direct from Chris White: SD Super doesn't come from any San Diego brewery. Like I said, Stone has a proprietary strain that is not sold. I'll see if I can dig up the strain # for you. SD Super is also good for stone clones in that it's not estery at all, ferments fast and flocs extremely hard. It is a much more finicky yeast to work with though. It's my house strain, so I know.
The reason some folks think one strain or the other is Stone's baby is that Stone's yeast is said to be an old British strain, which would fit with WLP007 since it flocs hard, ferments dry, and is not very estery, and the same with WLP090 (which is even more flavor-neutral).
Personally, I'd be willing to bet good money that WLP090 is a descendant of a British strain based on its hard floccing abilities and its freaking incredible need for oxygen and tight temperature control, but neither one is Stone's yeast. Both make for good clones, as I said, though.
Neva Parker was on the brewing network a few weeks ago and tasty asked her what brewery WLP090 came from and she said it was from a SD brewery but wouldn't name which and went pretty quiet.