Velvet Horn (Green Sponge Finger)
Codium tomentosum
These dark green, spongy fronds have a velvety surface and retain water well, making them soft to the touch even when exposed. Often referred to as “Green Sponge Finger,” it is sometimes found in calmer waters. Around Lihou, you may discover patches of Velvet Horn in deeper pools at low tide, feeling surprisingly squishy if gently squeezed – careful not to cause damage.
- Habitat: Lower shore and shallow subtidal; attaches to rocks, sometimes near kelp forests.
- When to See: Year-round
- Length: Thick, finger-like fronds can grow up to 20–30 cm long