I have not seen the same damage on wild plants that I have had happen on my cultivated plants. The damage for me happens when I take plants indoors to give a talk, then back outside. They could be indoors for as little as 45-50 minutes, and they can show brown scarring the next day. It is not all plants and not all times of year. Plants kept dry show less damage than well watered plants.
Curiously, this does not seem to happen to plants being shipped through the mail.
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