1828: Edible Rain Displayed at French Academy

The Legend:

In 1828, a substance was exhibited at the French Academy, which fell in the plains of Persia. It was eaten, and afforded nourishment to cattle, and many other animals; and, on examination, proved to be a vegetable,—the Lichen esculentus,—which had been carried there by the winds.


       I have only one source for this brief account at the moment, Charles Tomlinson's The Rain-Cloud and the Snow-Storm, and it needs to be dug into before it can be trusted... it's just too vague a statement without more info.