I am giving up too.
"They are easily machined, but as yet cannot be manufactured,
only found in space."
After the UA T-series debacle, this is yet another little issue due to poor communication, or lack thereof
After wasting a countless amount of time and almost dying, looking in SSS, USS and WSS (for barnacles), as well as on planets (for unknown bases and barnacles), I have discovered, the barnacles (which definately exist) are only found on planets, as points of interest (POI).
ONLY found on planets, not "
ONLY found in space".
The in-game description is very clear. Space only. Not planets.
The surface of a planet is not generally regarded as space. WSS, USS etc and asteroid fields/belts are space, but that is not where you will find them. The description should have read "only found on planets" or even "airless planets".
The fact that we weren't told what the green structures in the video were, added to this confusion. Like xdeath said "symptom of poor communication as a result of trying to be vague and esoteric".
Initially, I had found out about the barnacles existence, entirely accidentally, whilst looking for something totally unrelated (bobbleheads!). It is such a time sink searching a system, then even a small part of just one planet, nevermind signal sources, in frustration, I went back to my original source and found out what I now know. I had wasted my time for nothing.
I have since stopped looking in all senses, and to be honest I no longer care. For both the reason above and reasons below. If you can't be bothered reading, just go straight to the bit at the bottom. I really won't mind.
A while back I made an overly sarcastic post (sorry

) asking why, in all seriousness, would FD pull an all nighter finishing the trailer to Horizons and include a creepy teaser of space barnacles, when a huge number of people, including myself, are wishing for Thargoids, as evidenced by the number of people texting during the live stream. It now looks like that's exactly what they did. Space barnacles!
Thargoids? Terrifying and intrinsically linked with Elite...not one sign of them.
My only reason for searching for the barnacles was to glean more info with relation to the Thargoids. For me that is now a dead end. I still stand by my theory that the barnacles are brought in, originally, on the hulls of Thargoid ships, not that it matters anymore. There are other things for you to discover, when you discover them, but I'm not going to spoil that for you. You can see when you find them yourself.