Lichen contains more than 550 natural constituents. Lichens, zeorin, calycin, phycion, xanthomus, terpenoids, benzyl starch, usonic acid, rhizocarpic acid, salagenic acid (Ramalina fraxinea), lecanric acid (Parmelia saxatilis), squamatic acid (Cladonia rangiferina), arsenic acid, zeorin etc. goes