Biological production of this greenhouse gas, once thought to be the reserve of anaerobic microbes, occurs in these widespread, photosynthesizing cyanobacteria.

Anemones keep their algae populations in check.

A single-celled organism has an energy-producing enzyme with unique features.

An analysis suggests that DNA cribbed from soil microbes enabled plants’ ancestors to colonize a terrestrial environment.

The protist Rhodelphis limneticus bears little resemblance to its close genetic relative, red algae.

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Diverse plots of corals appeared healthier than monocultures at the end of a 16-month study.

Green fluorescent protein lures algal symbionts to corals.

Scientists discover a third fungus that is widespread in lichens, but it’s not clear yet whether it’s a partner in the algal-fungal symbiosis or a bystander.