FaunaHub

Mushroom Coral (Fungia and relatives)

Marine invertebrateCnidarianStony coral

A solitary mushroom coral (Fungia) showing radiating ridges.

Mushroom coral (Fungia sp.).

Image: Bernard DUPONT from FRANCE, CC BY-SA 2.0, via Wikimedia Commons.

Overview

Mushroom corals (genus Fungia and related genera) are unusual among reef corals: most are not colonies but a single, large polyp, with a rounded or oval disc and radiating ridges (septa) that recall the gills on the underside of a mushroom. Many are also free-living as adults — resting loose on the seabed rather than being cemented down.

Like other stony corals, they have a hard skeleton and usually host symbiotic algae, but their solitary, often mobile lifestyle sets them apart from the reef-building colony corals.

Note: there are many mushroom coral species with varying shapes and habits; treat general statements accordingly and verify against authoritative sources.

Habitat & Range

Mushroom corals live on tropical reefs, often on reef slopes, sandy patches, and rubble between reef structures, where free-living individuals can rest on the bottom. They favour the warm, clear, sunlit waters that suit their symbiotic algae.

Diet

Mushroom corals feed both by capturing plankton with the stinging tentacles of their large polyp and by drawing energy from symbiotic algae in their tissues. Some are known to be capable of taking relatively large food items for a coral.

Behavior

One of the most remarkable things about many mushroom corals is that, as free-living animals, they can right themselves if flipped over and even shift their position slightly by inflating tissue and using tentacle movements — a rare degree of mobility for a coral. They can also reproduce both sexually and by budding off small new individuals.

Human Interaction & Conservation

Mushroom corals are part of healthy reef communities and face the same broad pressures as other corals, including warming-driven bleaching and habitat damage. Their distinctive form makes them popular in aquariums, where responsibly sourced specimens are preferred. Consult authoritative sources for current status.

More photos of the mushroom coral

Mushroom coral disc with its tentacles extended.

Mushroom coral (Fungia fungites).

Image: Liné1, CC BY-SA 3.0, via Wikimedia Commons.

Frequently Asked Questions — Mushroom Coral

Is a mushroom coral a single animal or a colony?
Unlike most reef corals, many mushroom corals are a single large polyp rather than a colony of many small ones. The radiating ridges across the disc are part of that one animal's skeleton, and resemble the underside of a mushroom — hence the name.
Can mushroom corals move?
To a limited degree, yes. Many mushroom corals are free-living rather than cemented to the reef, and they can right themselves if overturned and even shift position slightly using tissue inflation and tentacle movements — unusual abilities for a coral.
Do mushroom corals build reefs?
Not in the way colonial corals do. Because they are typically solitary and often free-living, mushroom corals don't form large reef framework themselves, though they are part of the broader reef community and contribute to its diversity.
What do mushroom corals eat?
They capture plankton with stinging tentacles and also rely on energy from symbiotic algae in their tissues. Some can handle comparatively large prey items for a coral.

Sources and further reading

Authoritative wildlife references used for general educational context. Conservation status should always be verified against current IUCN Red List data. External links open in a new tab.