[labawi]

If it can photosynthesise (on gamma rays no less), then perhaps not. Mold can grow on concrete walls and stuff, so not sure what it needs.

[lopmotr]

It sounds like this fungus only produces energy, and doesn't fix carbon like photosynthesis does.

Mold growing on concrete walls is actually living off the dust and other organic debris that accumulates on the surface if you don't clean it.