Pom-pom weed (Caulacanthus okamurae)
Pom-pom weed is a small red seaweed forming dense springy tangled clumps. Native to Asia it was first recorded in the UK in 2004 on the S coast. It has distinctive short incurved thorn-like forked side branches. It is very common on the mid and low shore in the Tamar Estuaries area. Turf formation can alter habitat displacing macro-invertebrates, such as barnacles.
Environmental risk: MEDIUM
Economic risk: LOW
Image: C. Wood © MBA