Habitat 
Depth 
Group 
Role WHAT DOES IT LOOK LIKE?
The wormlike codium forms upright thalli, the algal bodies, with cylindrical green branches and often irregular divisions. Small side shoots can complicate the forks. Numerous hairs sometimes cover the surface.
Utricles, the swollen ends of superficial filaments, have rounded or slightly truncated tips. They lack the mucro, the small point used to recognise Codium fragile.
WHERE DOES IT LIVE?
It attaches to Mediterranean hard surfaces and is recorded along French coasts, often within mixed algal communities.
Follow branches to their base when describing a tuft rather than combining neighbouring parts. Depth and exposure supplement records but do not replace anatomical identification.
WHAT DOES IT EAT?
Photosynthesis produces organic matter using light energy and carbon available in water. The alga also absorbs mineral nutrients needed for growth.
Its body is siphonous: filaments contain many nuclei within shared contents, without regular cross-walls. The internal network and green outer ends form a continuous arrangement.
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