Sadly:

    We discovered that this is a close symbiosis of fungi and algae, not a lichen, though, because the fungus does not depend on its alga for nourishment.

As they say, That's the ..

https://www.fadedpage.com/showbook.php?pid=20220360

Also:

  The new term introduced by the researchers for this type of coexistence, "alcobiosis," is formed by letters from the three key words: algae, corticioid fungi and symbiosis.

I prefer falgosis, but... whatever.

Also:

  "And so the main unknown still is in what way this symbiosis is beneficial for each of the partners."

It's probably immune system--as in the algae help the funghi fend off predators/pathogens; or, binding, as in the algae secrete a substance that makes it easier for the funghi to attach to or burrow through the surfaces.

You must be a real fungi at parties

Depends on how much algal I'm drinking.

You're a fun gal. What do you say we ditch this party and get some nourishment? I hear you can drink your claw or fill at Autofluoresce in the red light district.