This red seaweed is Neorhodomela larix, or Black Pine. The clump does look like a miniature forest with thickly growing trees. Each frond is about 4-6" long. It's an abundant seaweed that grows on rocks, visible at a very low tide.
This red seaweed is called "Bladed Red Algae" in Andy Lamb's book, but with no scientific name. I found it growing on a rock at low tide. The larger blade was about 6" long, 4" wide, and the smaller blade about 3" long and 1" wide. It was very supple.
Here's Mastocarpus papillatus, aka Turkish Washcloth or Tar Spot Seaweed, a very common red seaweed that grows on rocks throughout the intertidal zone, but mostly in the lower part.
This beautiful red seaweed is Odonthalia washingtoniensis or Flattened Sea Brush, found on the beach during a low tide.
This is Endocladia muricata or Sea Moss, on this site another good common name, Scouring-pad Alga! It was on a rock, observed at low tide in the upper intertidal zone.
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...