Although it might be hard to tell from the picture, this algae is known for its texture — it's covered with small bumps or spines. They're dense, which gives the seaweed a rough texture. Because of this, someone came up with a distinctive name for it — Turkish Towel.
This is Chondracanthus. (My guess is Chondracanthus corymbiferus.) However, Turkish Towel is often easier to remember!
This towel was so big (you might call it a bath sheet!), Eric thought he'd give it a try:
There are over 200 species of seaweeds in the Bodega Bay region. I'll be trying to highlight more of them this year.