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spindles of magnified green algae
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Stringy Algae

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Many species of pink coralline algae, which cements coral reefs together, cover a reef surface in the Southern Line Islands.
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Pink Coralline Algae

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Algae or "seaweeds" (left) differ from seagrasses (right) in several ways.
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Algae vs Seagrass

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Red Algae
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Branching Red Algae

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an algae bloom around Florida is documented by a satellite
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Seeing Algae from Space

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Macroscopic Algae (Ventricaria ventricosa)
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Bubble Algae (Ventricaria ventricosa)

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Unlike the green, leafy algae we're used to seeing, coralline algae has a hard crust—which you can see here at the molecular level under a scanning electron microscope.
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Coralline Algae Under the Microscope

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Pink crustose algae covers the surface of a rock.
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Encrusting Pink Algae and a Seastar

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A close up image of green macroscopic algae.
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Macroscopic Algae (Acetabularia crenulata)

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Sylvia Earle on a beach
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Sylvia Earle’s Algae Epic

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A close-up photo of Killer Algae, Caulerpa taxifolia, a seaweed that has proven to be a successful invasive species.
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Killer Algae (Caulerpa taxifolia)

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These corals are dead—smothered in sediments and overgrown with algae.
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Dead Coral Overgrown with Algae

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