San Diego County, California, US
These two colonies of Membranipora villosa (Kelp-encrusting Bryozoan) were on a large kelp frond on the beach.
Plenty of this at the Berkeley marina, but I couldn't find any Polycera on it.
A type of bryozoa. This is a colony of many small stinging animals that forms this colorful hard structure that resembles a net and also some types of red algae, however this is not a plant.
The Bryozoa, also known as Polyzoa, Ectoprocta or commonly as moss animals, are a phylum of aquatic invertebrate animals. Typically about 0.5 millimetres (0.020 in) long, they are filter feeders that sieve food particles out of the water using a retractable lophophore, a "crown" of tentacles lined with cilia. Most marine species live in tropical waters, but a few occur in oceanic trenches, and others are found in polar waters. One class lives only in a variety...