On mud flats, at low tide.
Here's one of the few patches of Halosaccion glandiforme (Sea Sacs aka Sacks) I saw at Salt Creek. I think there will be more as the summer begins.
Another gorgeous coralline seaweed at Salt Creek: Corallina vancouveriensis (Graceful Coralline).
There's so much beautiful coralline algae at Salt Creek. This one is Corallina officinalis var. chilensis (Pink Feather Coralline).
The red algae, or Rhodophyta (/roʊˈdɒfɨtə/ roh-DOF-fit-tə or /ˌroʊdəˈfaɪtə/ ROH-də-FY-tə; from Ancient Greek: ῥόδον rhodon, "rose" and φυτόν phyton, "plant"), are one of the oldest groups of eukaryotic algae, and also one of the largest, with about 5,000–6,000 species of mostly multicellular, marine algae, including many notable seaweeds. Other references indicate as many as 10,000 species; more detailed counts indicate about 4,000 in about 600 genera (3,738 marine species in 546 genera and 10 orders (plus...