blue_lotus's Identifications

With considerable symbiotic green algae. This sponge was,rather unusually in my experience, in moderately heavy shade on the southern side of the mid to outer jetty. However it was on the bottom, facing the surface, unlike the many other examples of what is probably the same taxon growing on the vertical piles in the deeper shade mid jetty. So I guess it was still getting sufficient ambient light, daily, to facilitate green algal presence. But I am speculating beyond the limits of my knowledge 😁.