Tree Trunk of Tibouchina
Tibouchinas
Tibouchina shows green patches with black backs on trunk. Owner suspects mold/disease.
Greenish, crusty patches = lichens (algae + fungus symbionts). Not pathogens; they photosynthesize on bark surface.
Lichens favor older woody plants or those in shade/thin canopy. Their presence may signal reduced vigor, but they cause none. No treatment needed. Google "lichens on trees" for confirmation.
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