I’m taken by the graduation in hue from the medium green outer circle to the white inner core. In these.
Again as with all these lichen sightings, I know too little to be clear I am not conflating species whether within or across sightings. The other sightings relevant to that comment are: 4647881 (this one), 4647883, 4647896, 4647907, 4647914 & 4647961 (this one),
This lichen is yet another which colonized a shade cloth canopy. (The canopy collapsed a few years ago and a substantial amount of leaf litter has accumulated in the depression formed in the top, with several ferns & other plants colonizing the underside).