"Actually, if it's fungal, then the Thing might not be able to assimilate it at all. It's already canon that the Thing can't assimilate plant cells. I see no reason why fungus cells would be different."
The comic "The Thing from another World: Climate of Fear". The whole comic takes place in a humid jungle, and MacCready mentions that if it could assimilate plant life, then the whole jungle should've been attacking them.
How's going on? I see you are the one who made Blood Lad profile which something I'm really interested in, since blood lad is one of my favorite manga. I'd like to discuss on the verse a bit if you don't mind ^^ we can move this conversation to Discord if you want. Thanks.