Evernia prunastri.

Botanical name: 

Evernia prunastri Linn. Lichenes. Ach.

Northern Europe, America and Asia. This lichen was observed by Sibthorp and Bory on the branches of plum and other trees throughout Greece and around Constantinople. According to Forskal, it is imported in shiploads from Greece into Egypt and mixed in bread. According to Lindley, it has a peculiar power of imbibing and retaining odors.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.