calloused cactus after drying the cut holding in hand. selective focus

background cacti cactus calloused callus care closeup cut cutting dead decay decease disease dried dry drying euphorbia euphorbiaceae focus fresh fungi fungus ghost grow growing hand holding lactea mushy overwater plant problem propagate propagation pulcherrima root rooting rot rotten rotting save saving selective shrivel squishy stem succulent water white wound