# Coralline algae (*Corallinales*)

Coralline algae are special plants that live in the ocean. They help make coral reefs strong and colorful, providing homes for many sea creatures.

- **Category:** [Plants](https://www.snappit.app/explore/categories/plant)
- **Rarity:** Common
- **Danger:** 1/5 · Very low
- **Habitat:** Coastal areas

![Coralline algae](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Corallina_elongata.jpg&width=800)

Photo: Guido Picchetti - http://www.guidopicchetti.it, CC BY-SA 3.0 · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Corallina_elongata.jpg)

## Appearance

The Coralline algae is primarily pink, red, or purple, forming hard, stony crusts or intricate branching structures. Unlike soft, leafy seaweeds, its unique calcified body makes it feel rough and rigid, resembling tiny underwater rocks or corals.

## Taxonomy

- **Kingdom:** Plantae
- **Phylum:** Rhodophyta
- **Class:** Florideophyceae
- **Order:** Corallinales

## Interesting facts

- Fossils show these ancient plants have been growing in oceans for over 500 million years!
- Some make natural sunscreen to protect themselves from harsh sunlight!
- Their tough, stony bodies are made of calcium carbonate, just like clam shells!
- These ocean architects help build huge coral reefs by cementing them together!

## Special abilities

- **Stony Shield:** Coralline algae can harden its body with calcium carbonate, creating a tough, protective shield against grazers and strong currents.
- **Light Seeker:** Coralline algae has special pigments that help it capture sunlight in deeper, dimmer waters, allowing it to photosynthesize.
- **Coral Caller:** Coralline algae releases chemical signals that attract baby coral polyps, guiding them to settle and helping new coral reefs grow.

## Measurements & details

- **Height:** 0.1-20 cm
- **Spread:** 1-50 cm
- **Edible:** No
- **Toxicity:** None
- **Lifecycle:** Perennial
- **Pollination Method:** Water

## Ecological connections

- **Depends on:** Staghorn Coral (*Acropora cervicornis*) — Coral larvae often settle on coralline algae to grow.
- **Eaten by:** Dusky Rabbitfish (*Siganus luridus*) — Herbivorous rabbitfish commonly graze on coralline algae.
- **Eaten by:** Rock-boring Urchin (*Echinometra lucunter*) — Sea urchins scrape and consume the calcified algae surfaces.

## Traits

- [Nonvascular](https://www.snappit.app/explore/traits/nonvascular): This trait characterizes plants lacking specialized vascular tissues (xylem and phloem) for transporting water and nutrients.
- [Salt Tolerant](https://www.snappit.app/explore/traits/salt-tolerant): Salt tolerant plants can withstand and grow in conditions with elevated salinity levels in the soil or water.
- [Colorful](https://www.snappit.app/explore/traits/colorful): Colorful describes organisms or objects displaying a wide range of bright and distinct colors.
- [Ancient Lineage](https://www.snappit.app/explore/traits/ancient-lineage): This trait signifies organisms belonging to a very old evolutionary group with ancestors dating back millions of years.
- [Decomposer](https://www.snappit.app/explore/traits/decomposer): Describes organisms that break down dead organic material, recycling nutrients back into the ecosystem.
- [Coastal](https://www.snappit.app/explore/traits/coastal): Coastal habitats are dynamic environments located along the interface between land and sea, influenced by tides, waves, and saltwater.
- [Keystone Species](https://www.snappit.app/explore/traits/keystone-species): Describes a species whose presence and role have a disproportionately large effect on its environment.
- [Marine](https://www.snappit.app/explore/traits/marine): Marine habitats encompass all saltwater environments of the Earth's oceans, supporting an immense diversity of aquatic life.

## Collections

- [Plants](https://www.snappit.app/explore/collections/plants)

## Safety

**Danger:** 1/5 · Very low

Always look but don't touch ocean plants, as they are important for sea life.

## Frequently Asked Questions

### How to identify Coralline algae?

Start with the whole plant, then compare leaf arrangement, leaf edges, stems and any flowers or fruit. Opposite leaves grow in pairs; alternate leaves come one at a time along the stem. These details tell you far more together than a single green leaf does. Plant Identifier: upload a photo and compare the visible details.

### How tall is Coralline algae?

0.1-20 cm

### How wide does Coralline algae spread?

1-50 cm

### Is Coralline algae edible?

No

### Is Coralline algae toxic?

None

### What is Coralline algae's lifecycle?

Perennial

### How is Coralline algae pollinated?

Water

### Where is Coralline algae usually found?

Coastal areas

## More Plants

- [white snakeroot](https://www.snappit.app/explore/white-snakeroot) (*Ageratina altissima*)
- [tree-of-heaven](https://www.snappit.app/explore/tree-of-heaven) (*Ailanthus altissima*)
- [western sword fern](https://www.snappit.app/explore/western-sword-fern) (*Polystichum munitum*)
- [common milkweed](https://www.snappit.app/explore/common-milkweed) (*Asclepias syriaca*)

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Source: [Coralline algae: Facts & Places to See — Snappit](https://www.snappit.app/explore/coralline-algae)