I'll leave that here:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC48023/
"This congruence among multiple lines of evidence strongly suggests, in contrast to traditional and current classification, that animals and fungi are sister groups while plants constitute an independent evolutionary lineage."
Regardless of their evolutionary lineage, the important ethical consideration is whether one's food has a central nervous system. Most animals have those whereas fungi and plants do not.
It seems to me that the "ethical considerations" are highly personal and vary from people to people.
In any case, I note that tongue-in-cheek comments are not appreciated. Sad.
You can't just retreat to ethics are personal when you just implied that a group of people were irrational for being willing to eat fungus. If you didn't intend to imply that then then downvotes show you should work on your communication skills.
Or perhaps you should work on your interpersonal and maturity skills... I didn't imply anything, you lost it over nothing trying to see things where there was obviously none. I was just tongue-in-cheek by putting some scientific facts out there, which may in fact trigger a real reflection of what not eating any animal product might mean to someone (and your point was just a generalisation that does not represent all views).
It's like Reddit here. Too bad. It was a good resource.
I'll let vegans ponder that one...