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This is Caulerpa Taxifolia it is causing major problems with native Kelp and other marine plants in the Mediterranean Sea. It has been found off San Diego & Huntington Harbor recently. Report all sightings if seen while diving or boating. Don't confuse this with Caulerpa Mexicana which is very similar. Run a SEARCH on these plant names to fully understand the differences, there are many web sites that have pictures and more info. It appears that many people use this nasty stuff in their aquariums and they could accidentally release it when they dump their aquariums down storm drains (Which is illegal), then it ends up in our ocean, this would be BAD.
Send ME (Rich) anything that you find on the net, like WHO do we tell if we see it (Locally)??? According to the reports I've read, this stuff is illegal to sell or posses according to Federal Law in the US. If you see someone who may unknowingly have this stuff in their aquarium, have them dispose of it, NOT where it can get in our ocean. Some reports says this stuff can last 10 days out of water. Even one little piece can start a whole new formation. According to the NOAA, this Algae can and will damage our Lobster populations, we can't have this. Not to mention, Halibut, & Sea Basses.
If you see this, do NOT attempt to remove this yourself, make notes on the location of where it is, what type of bottom it is on (Sand, rock, etc), depth, date & time of the sighting.

Updates:
The LA-Times ran this article about Caulerpa on 10-10-2000.
Copy of LA-Times article.

So how do they get rid of it?? Here is what is going around:
Author: sanddiver
Date: 08-15-2000 15:37
I've read that they've covered existing patches with tarps and have infused the water with chlorine bleach. I believe they may plan to leave the covers in place for an indefinite period. Wish I had a link for you. Good luck out there!

Thanks for the input, now let's find out more info...

Contacts for sightings:
Rachel Woodfield
Merkel & Associates
858-560-5465
or
Bob Hoffman
National Marine Fisheries Service
562-980-4043

Since most sites related to this stuff, is in
languages other than English, please
send me English only sites.
Check out these English language links:
(I cannot vouch for these links, check them out)
Official S CA Caulerpa Site.
Where Divers report outbreaks.
NOAA.
Discovery Channel (Canada).
San Francisco Chronicle.
Wired.com

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since 07-06-2000.