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Brown Algea, Phylum Phaeophyta. Brown algae contain chlorophyll, but the green color is hidden by gold and brown pigments, which look like light green to dark black because of their varying proportions.
Genus Fucus is vesicled and dichotomously branched. (Fucus = seaweed in Greek).

"When a seaweed branches dichotomously it produces two nearly equal branches, directly opposite each other, looking much like the letter Y. As this process is repeated, the plant assumes an overall flattened appearance. . ."
Pacific Seaweed: a Guide to Common Seaweeds of the West Coast. 2nd ed., Louis D. Druehl and Bridgette E. Clarkston, pp. 180-182.

Per SEANET (Stanford University’s Hopkins Marine Station) what was previously identified as Fucus distichus, is now called Fucus gardneri:
Fucus gardneri
Phylum Ochrophyta, Class Phaeophyceae, Order Fucales, Family Fucaceae
Thallus to 25 cm tall, flattened dichotomous branches with midrib, 15-25 mm wide; olive-brown. Reproductive conceptacles concentrated at branch tips (swollen when mature).
Common, upper mid-intertidal zone, protected outer coast.
Geogr. Range: Washington to Pt. Conception
Synonyms: previously identified as Fucus distichus
https://seanet.stanford.edu/brown#Fucus

Very curious what species this is! Never heard of any looking like this. Has blue on bottom/side and gold spots on tips with speckles between and none more than an inch long. More than 15 for sure but only in one pool.