lichens overgrown tree trunk, symbiosis of fungus and algae, indicator species

adscendens algae aspicilia caloplaca candelariell candelariella cladonia closeup lichen ecosystem flashing light flora forest fungi fungus green indicator species lecanora lichens macro shoot moss nature parmelia physcia plant rinodina shore slider shot surface symbiosis symbiotic texture tree verrucaria wild xanthoparmelia yellow