Fungus protein just means mushrooms.I generally avoid and am not a big fan but I'll eat them on occasion.
Stuff I always avoid:
Anything with the majority being made up of protein isolates, for instance, soy protein isolate. While it contains a good amount of protein and an array of minerals, protein isolates like soy protein isolate can raise IGF-1.
Products that are 50% or more extracts - from beans, from rice, from herbs etc.
"Fungus protein" like Quorn stuff. I completely distrust it.
Stuff I sometimes eat:
Patties or tubes as burger/hot dog replacements that have 51% or more whole food, and also contain at least some fiber.
Coconut cream ice cream that is made with sugar and flavors. Although I avoid HFCS as I've found this (or this in combination with other stuff) actually hurts my stomach.
Mostly the "sometimes eat" stuff is fairly rare. Aside from the coconut cream ice cream, I've found that many of the mock meats don't fill me up, or I need to eat the whole package. Not a big fan of spending money on food stuffs that don't satisfy, and don't feed (or feed well enough) the beneficial bacteria.