Lecanora affinis, Lecanora esculenta.
Lecanora affinis Linn. Lichenes. Crab's Eye.
This lichen is found in Armenia and Algeria, blown about and heaped up by the winds. It is ground with corn in times of scarcity to eke out the scanty supply.
Lecanora esculenta Linn. Cup Moss.
This lichen was found by Ledebour in the Kirghiz Steppe and in middle Asia, frequently on a barren soil or in clefts of rocks, whence it is often washed down after sudden and violent falls of rain, so as to be collected in considerable quantity and easily gathered for food. The same species was found by Paviot, who procured it in his journey to Ararat, where it is eaten by the natives. In some districts of Persia, in 1828, it covered the ground to a depth of five or six inches in so short a period of time that the people thought it had been rained down from heaven. This lichen is supposed by some to have been the manna of the children of Israel.
Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.