Codium spongiosum
A light-green, spongy seaweed of warmer and tropical waters.
Codium spongiosum is a species of green seaweed belonging to the family Codiaceae. Its light-green body, or thallus, grows in a flattened to cushion-like shape, typically measuring 10 to 25 centimeters across and about 20 millimeters thick. The thallus has irregular lobes and is moderately firm when alive, but becomes noticeably spongy after death. The plant’s utricles—small, bladder-like structures—grow in large clusters, each 2 to 6 millimeters long and covered with many hairs.
This species closely resembles *Codium lucasii*, but differs in that *C. lucasii* attaches more tightly to rock surfaces. *C. spongiosum* grows on rocks (epilithic) in both the subtidal and intertidal zones, usually in calmer waters from the low tide mark down to several meters deep. It is common in warmer waters, though it also appears in scattered locations in colder waters.
The species was first formally described in 1855 by botanist William Henry Harvey in *Some Accounts of the Marine Botany of the Colony of Western Australia*, published in the *Transactions of the Royal Irish Academy*. The type specimen was collected from King George Sound on the south coast of Western Australia. In Western Australia, it occurs along the coast from the Kimberley region south to the Recherche Archipelago. It is also found along the South Australian coasts, including the Eyre Peninsula, Yorke Peninsula, Kangaroo Island, and Fleurieu Peninsula. Overall, it is common in all tropical and subtropical waters.
Quick Facts
- Genus
- Codium
- Species
- spongiosum
Facts from the source article.
Lore & Background
Codium spongiosum was first formally described by the botanist William Henry Harvey in 1855, in a work titled *Some Accounts of the Marine Botany of the Colony of Western Australia*, published in the *Transactions of the Royal Irish Academy*. The type specimen was collected from King George Sound along the south coast of Western Australia. The species has a light-green thallus with an applanate-to-pulvinate habit, typically 10 to 25 cm across and about 20 mm thick. It features irregular lobes and is moderately firm when alive, becoming more spongy once dead. The utricles form in large clusters, are 2 to 6 mm long, and are coated in many hairs.
Reader's Guide
Codium spongiosum is significant as a common macroalga in tropical and subtropical waters, with a distribution that includes the Kimberley and Recherche Archipelago in Western Australia, as well as the Eyre Peninsula, Yorke Peninsula, Kangaroo Island, and Fleurieu Peninsula in South Australia. It is epilithic in both subtidal and intertidal zones, typically found in calmer waters from the low tide mark to several metres depth. While often found in warmer waters, it also has a scattered distribution in colder waters. The species is similar to *Codium lucasii*, which differs by adhering more tightly to rock surfaces. Its description by William Henry Harvey in 1855 adds historical botanical value, and its morphological traits—such as the hairy utricles and spongy texture after death—aid in identification. The species' presence across a range of latitudes and its preference for calmer waters contribute to its ecological role in marine habitats.
Did You Know?
- The thallus of Codium spongiosum becomes more spongy once dead.
- Its utricles are coated in many hairs and form in large clusters.
- It is similar to Codium lucasii, which adheres more tightly to rock surfaces.
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