Here are a few photos of the wild yeast I captured from my backyard. They look like pretty standard yeast to me - not sure I can tell much more simply based on their physiology (Brettanomyces? Saccharomyces?). I'm no microbiologist, but they appear to be in pretty good shape; I think there are even some showing some budding. Some rough measurements of the cells give cell lengths of 9-11µm and widths of 4-7µm. I'm not entirely sure what the smaller "specks" are - they seem too big to be bacteria, but I suppose they could be. I recently brewed up a relatively simple "saison" with this culture that is happily fermenting away at the moment (post and recipe here).
All photos were taken with a Nikon D90 mounted on a Nikon Eclipse TS100 inverted microscope at 400x total magnification.
(click on each image for a larger version)