How to kill off monti digitata

I have some encrusted monti digitata on my rocks that's taking over any ideas on how to kill it? 1 thing is I cannot remove the rock structure. It's just taking over. I can put putty over it but I'm looking for other possible ideas
 
Epoxy is the only option I have found. Break all branches off and cover the encrusted part.


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Good luck. I searched for someone to give me monti nudies but no one came through locally for me.
 
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