the old surface of the slate with yellow moss and mushrooms

abstract algae are associations backdrop background branches brown close closeup construction cover covered cyanobacteria day design dry external fissure flora forms fungi gradient gray green grey grunge home layer light macro material microscopic moss mushrooms mushroomslichens mycobiont nature old outdoor outdoors outside pattern photobiont phycobiont ribbed roof roofing slate stone stony structure sunlight sunny surface symbiotic texture textured vintage wall wallpaper wavy yellow