This heavily textured kelp is Saccharina latissima or Sugar Wrack Kelp. I see on this site it's called Sea Belt. This frond was only about 10" long.
This is one of many Pterygophora californica or Old Growth Kelp I found on the beach. They get dislodged from their holdfasts in winter storms. This one was about 4' long, with fronds up to a foot long, and its stem had a diameter of about 1". The longest I've found is about 5' long.
The local beaches have piles of Nereocystis luetkeana or Bull Kelp this time of year, often extremely tangled and knotted together.
This piece of Macrocystis integrifolia or Small Giant Kelp is quite bedraggled after tossing about in the surf after winter storms.
Algae in dry wadi pool
Note the bladder. Growing attached to oyster culture sacs.
File limpet herbivory on feather boa kelp, washed up on the beach along Crystal Cove. This is the kelp observation. I have entered the limpet observation separately.
The Phaeophyceae or brown algae (singular: alga), is a large group of mostly marine multicellular algae, including many seaweeds of colder Northern Hemisphere waters. They play an important role in marine environments, both as food and for the habitats they form. For instance Macrocystis, a kelp of the order Laminariales, may reach 60 m in length, and forms prominent underwater forests. Another example is Sargassum, which creates unique habitats in the tropical waters of the Sargasso Sea....