James,
35 years ago I knew a very old Sourdough mountain man who lived very high up in the Colorado Rockies. He once told me you could leaven bread with the yeast that grows on aspen tree bark. Rubbing your hands on the bark of the aspen tree will remove a bunch of white powder that he claimed was very close to bread yeast. I never heard of this before and have never tried it. If any of your readers know about this or would be willing to try it, this would be a very good survival skill to know. I also found this article online from The Mother Earth News that verifies what the old Sourdough told me. Thanks, – Montrose Prepper
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