close up of the textured bark of a poplar tree with a variety of lichens growing on the wood

candelariella environment educational background dendrology horizontal candelaria cottonwood scientific wisconsin wallpaper punctelia goldspeck vitellina deltoides textured lighting outdoors speckled bolliana crustose hammered parmelia concolor variety lichens growing america texture peeling eastern sulcata foliose cracked populus details poplar trevor nature summer united states lichen shield common candle yellow close macro trunk flame brown green black white bark tree wood side usa tan