Caulerpa sertularioides
A warm-water seaweed with feather-like fronds and creeping stolons.
Caulerpa sertularioides, called green feather algae, is a warm-water seaweed from the Caulerpaceae family. Its thallus ranges from pale to dark green and spreads outward between 0.35 and 2 metres. Feather-like fronds grow upright from a shared stolon, each frond branching with opposite, cylindrical to needle-shaped branchlets. These branchlets measure 3 to 11 millimetres long, have upcurved tips ending in a blunt point, and attach to a central axis 1 to 1.5 millimetres in diameter. Each axis connects a frond to a creeping stolon that is 2 to 2.5 millimetres thick and can reach 2 metres in length. The stolons branch into slim points, and rhizoids form on their lower surface, forking and penetrating sandy substrate to anchor the seaweed firmly.
The species was first formally described by botanist Marshall Avery Howe in 1905, published in the *Bulletin of the Torrey Botanical Club* as part of "Phycological studies - II. New Chlorophyceae, new Rhodophyceae and miscellaneous notes." Its basionym, *Fucus sertularioides*, was described by Samuel Gottlieb Gmelin in 1768.
Widely distributed through tropical waters, in the United States it occurs from North Carolina to Florida. It is found throughout the Caribbean—including Bermuda, the Bahamas, the Greater and Lesser Antilles—as well as in the Gulf of Mexico and the southern Atlantic Ocean down to Brazil. In the Pacific, it appears along the Great Barrier Reef in Australia, Papua New Guinea, the Philippines, and Palau. In Western Australia, it ranges from the Kimberley region south to the Gascoyne coast.
The seaweed typically inhabits coastal and estuarine environments, growing in sandy areas, seagrass beds, or on and around mangrove roots. It is mostly a shallow-water species, found at depths up to about 10 metres, though sparse individuals have been collected as deep as 110 metres.
Quick Facts
- Genus
- Caulerpa
- Species
- sertularioides
Facts from the source article.
Lore & Background
The species was first formally described by botanist Marshall Avery Howe in 1905 in the Bulletin of the Torrey Botanical Club, based on the basionym Fucus sertularioides described by Samuel Gottlieb Gmelin in 1768. The seaweed has a pale to dark-green thallus that grows outward to around 0.35 to 2 metres. Its feather-like fronds are upright and branched, with oppositely arranged branchlets that are cylindrical to needle-shaped, featuring upcurved tips with a blunt point. Each branchlet is 3 to 11 millimetres long and attached to a cylindrical axis 1 to 1.5 mm in diameter. Each axis connects a frond to a creeping stolon 2 to 2.5 mm in diameter and up to 2 metres long. The stolons branch out to slim points, and rhizoids form from the bottom surface, forking and penetrating sandy substrate to anchor the seaweed firmly.
Reader's Guide
Caulerpa sertularioides is widely distributed through tropical waters. In the United States it is found from North Carolina to Florida, throughout the Caribbean around Bermuda, Bahamas, Greater and Lesser Antilles, in the Gulf of Mexico, and in the southern Atlantic Ocean to Brazil. It also occurs in the Pacific Ocean along the Great Barrier Reef in Australia, Papua New Guinea, Philippines, and Palau, and in Western Australia from the Kimberley region south to the Gascoyne. The species typically inhabits coastal and estuarine environments, growing in sandy areas, seagrass beds, or on and around mangrove roots. It is mostly a shallow-water specimen found to depths of around 10 metres, though sparse individuals have been taken from depths up to 110 metres. Its ability to anchor in sandy substrates via forking rhizoids and its presence across multiple ocean basins highlight its ecological role in warm-water marine ecosystems.
Did You Know?
- The species was first formally described by Marshall Avery Howe in 1905.
- The stolon can reach up to 2 metres in length.
- Sparse individuals have been found at depths up to 110 metres.
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