Have to say, I have never seen anything quite like this, it is Red lichen, Cryptothecia rubrocincata.
This was found along the Rosemary Ridge Trail Loop at the Jacksonville Arboretum and Gardens in Jacksonville, Florida. I want to thank Lad Hawkins and Lynda Aycock of the Jacksonville Arboretum and Gardens for the assistance in identifying this lichen.
Dance of Light, March of Science
22 hours ago