Wikipedia
Desmarestia
Desmarestia is a genus of brown algae found worldwide. Members of this genus can be either annual or perennial. Annual members of this genus can produce and store sulfuric acid in intracellular vacuoles. When exposed to air they release the acid, thereby destroying themselves and nearby seaweeds in the process. They are found in shallow intertidal areas.
Usage examples of "desmarestia".
Along the sides of the rocks and in the tidepools between them were twenty types of seaweed, the kelps and red-purple lavers, and a species called desmarestia that used poison to ward off predators.