I'm wondering if this is Rhynchozoon rostratum aka Yellow Enrusting Bryozoan? I found it encrusted on a rock in the low intertidal zone. Each colony (?) is about 1-3" across. Those are very tiny baby Thatched Barnacles growing on the rock among them.
Many colonies attached to an underwater tree.
Picked this bryozoan colony thinking it was a red algae, then got completely distracted by the sea spider. ID based on pink color and aparent absence of avicularia.
This Membranipora serrilamella or Kelp-encrusting Bryozoan is growing on kelp this time of year. This piece of kelp, found during the minus tide growing on a huge rock, was about 5" wide and probably 6' long or longer, and was covered with colonies of bryozoans. Apparently each colony begins in the center of each circle and grow outwards. The second photo shows detail with my macro lens.
tidepool scene, Martin Luther King shoreline park, Oakland, California
Planta con hojas verdes aterciopeladas y gruesas, cuya flor es de color violeta
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...