extreme close up of the bark of a cottonwood tree with several varieties of lichen

nature background wallpaper dendrology close macro side lighting tree trunk bark outdoors summer trevor wisconsin usa united states america environment horizontal texture peeling lichen eastern speckled shield punctelia bolliana common goldspeck crustose candelariella vitellina hammered parmelia sulcata foliose cracked candle flame candelaria concolor cottonwood populus deltoides brown gren yellow black tan extreme varieties including shiled