Organism occurring as crusty patches on tree trunks

Let's find possible answers to "Organism occurring as crusty patches on tree trunks" crossword clue. First of all, we will look for a few extra hints for this entry: Organism occurring as crusty patches on tree trunks. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.