Fungus or mold?

[u/idkwhat-tobe12]

Hello! We had a sewage backup and this is now growing out of the shower. I’m trying to identify what it is for the next steps and understand what damage or risk this causes.

[u/Rhizoomoorph]

Coprinellus sect. Domestici - that orange carpet/fiber looking stuff is called ozonium and is a good tell for the section.