Multiple choice Which algae is inedible to most herbivores? Caulerpa lentillifera Caulerpa taxifolia Codium tomentosum Halimeda Reveal answer Fill a bubble to check yourself D Correct answer Explanation Halimeda is a green macroalgae. Its thallus is composed of calcified green segments. Calcium carbonate is deposited in its tissues, making it inedible to most herbivores.