λειχήν · leichēn — LSJ
tree-moss, lichen, implied in Thphr. (cf. λειχηνιάω).
a kind of liver-wort, that grows on damp rocks, Dsc. 4.53; but ἵππειος λ., = ἱππολειχήν, Nic. Th. 945.
a lichen-like eruption on the skin of animals, esp. on the chin, mentagra, A. Ch. 281 (pl.), Hp. Aph. 3.20 (pl.), Thphr. Sud. 14 (pl.), LXX Le. 21.20, Gal. 14.75, Aët. 8.16; also, of the ground, blight, canker, A. Eu. 785 (lyr.).
in horses, the normal callosity on foreleg, chestnut, Dsc. 2.43 (pl.), Cael.Aur. TP 1.138 (pl.).—In codd. freq. written λιχήν.