Been studying plant-fungal interactions for about 10 years, including a master's degree I dropped out of and never actually finished* so I'm full of fungus facts i don't really get to use ever.
*Actually did all the course work and lab work but didn't finish my thesis in time
When our species is evolved enough maybe we can figure that out...........
Honestly I am really annoyed by Big Vegan's (PETA's?) "anti-speciesist" campaign because deciding that animal species are worthy of protecting but plant and other species aren't is the most speciest thing I can think of. And just like how in general with agriculture the pigs get fed high calorie garbage that is probably not their preferred or natural diet, we grow plants and mushrooms on what is most convenient to us, not what is most healthy and enjoyable for them. Like you think an oyster mushroom really wants to be grown in just sawdust, or just straw?? Those bitches make so many enzymes!! They love eating everything!!!
And on a more philosophical note, life is pain. So why wouldn't raising animals in an environment where they don't have to worry about where their next meal's coming from, where we've controlled the environment to avoid triggering as much predator panic as possible, and treat/eliminate their diseases, then kill them before they reach the pain of old age, be considered humane? Especially species we've domesticated to the point where they aren't very well adapted to the "wild" anymore (so would go extinct without being kept by us). Yes of course factory farms are terrible and disgusting........
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I think the basis of most veganism is they can't hear plants scream so they're not squeamish about it. But plants do communicate their trauma, they release gasses when they're injured that tell the other plants (other species, even) "watch the fuck out something is trying to kill me over here" so the surrounding plants can set up defenses. The gasses are also a cry for help to the predatory insects to come and eat the bitches that are nibbling on me. They also release different gaseous "screams" when attacked by different kinds of herbivores (for examples ones that bite off chunks of leaf vs ones that stab and suck). And that's just the aboveground stuff, not any kind of communication that can be happening along the fungal network entwined in their roots. So if there's a chance fungi have a nervous system, there's a chance that the superorganism including the plants connected to them also share that nervous system.