<p><strong>Fig. 2.3.</strong>&nbsp;(<strong>C</strong>) Green macroalga sea lettuce, <em>Ulva</em> sp., in a coastal, rocky intertidal zone</p>

Fig. 2.3. (C) Green macroalga sea lettuce, Ulva sp., in a coastal, rocky intertidal zone

Image courtesy of Anthony Giorgio, Wikimedia Commons