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They found that the disease not only reduces susceptible coral populations but also diminishes crustose coralline algae, the resilient pink crust that is crucial for building reef structure.

“Then the magic really happens,” she said, “to reveal patterns, variations in color and some crustose types that are otherwise hidden.”

The crustose types appear as a skin on a rock or tree.

In structure, the thallus is crustose, and the thalli vary from inconspicuous, evanescent conditions to those which are conspicuous and sometimes even subsquamulous.

On shaded sandstone, intermingled with an ash-gray, crustose thallus, which appeared like a sterile Pertusaria.