This was the only lycopod I saw on the island, and actually one of the first lycopods I remember seeing in a long time. Maybe they're not common or absent from the Bay Area, but they were old stand-by's in the Eastern forests I tromped through as a kid.
Update: ID provided by John Game on Flickr.
Lycopodiella cernua is a plant in the family Lycopodiaceae commonly known as the staghorn clubmoss. The Hawai'ian name for the plant is wÄwaeÊ»iole.