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
Annnnd a lot of the endophytes that do that are in the same group as Claviceps purpurea, aka ergot fungus, our friend that makes the ergotamine that we can turn into LSD.
But we (humans) hate them because they can make our cows sick or something.
that is so gross but also so cool