lichens can produce acid to break down rocks
map_lichen is not lichen. wheat_leaf_rust is fungus. group_of_lichens is naturally_occurring_tangible_substance. lichen is fungus. wheat_leaf_rust is not fungus. lichenomphalia is not fungus. physcia_stellaris is lichen. lichenales is not fungus_order. lichen is not fungus. lichenomphalia is fungus.