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Kelps are large, brown algae that grow along coasts around the world, especially in cooler regions.
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Kelp Pennant

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a frond of red algae
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Fronds of Nori

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Seagrasses don't just provide shelter for free-swimming animals, but also are a habitat for non-moving organisms, such as these sea anemones.
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Anemone on Seagrass Blade

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Mangrove roots provide an underwater habitat for many marine species.
Slideshow

Mangroves: Photos of Plants and Animals

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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
Slideshow

Zooxanthellae and Coral Bleaching

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Algae covers beds of seagrass.
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Algae-covered Seagrass in Tampa Bay

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Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas Island.
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Unhealthy Coral Reef, Kiritimi, Line Islands

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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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An algal bloom, also known as a red tide, has converted the ocean's surf to a red color
Article

Scientists Work to Predict and Prevent Algae Blooms

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A spiraled diatom with spines.
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A Diatom Helix

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This shrimp is colored to fit in - probably why they are common members of the seaweed community.
Slideshow

A World Adrift: Life in the Sargassum Slideshow

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Seagrasses are flowering plants that can form dense underwater meadows and are an important shallow water habitat.
Overview

Seagrass and Seagrass Beds

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