I have a hard time sharing my worldbuilding publicly, so my buddy @theoarfishexpress and I are holding each other accountable for small, commitment weekly posts. With that in mind, here's a very small thing on fungi in my setting -
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If you’re seeking something a little too esoteric for the usual channels, and you don’t mind getting your hands dirty, there’s always the Unseen Market. Dreams and nightmares, next year’s weather, memories of the dead, crop yield forecasts, access to covert messages, secrets from the depths of earth and time - it’s all on offer, in the darkness of soil, not far away. The marketeers themselves live as nets of white threaded through the ground, only emerging with fruitbodies occasionally, to offer a mushroom flavoured with recollections foraged from corpses and tree-ruins. You’re unlikely to see the Market or its owners in any real sense, in fact. You’ll probably want to go through a local myceliomancer - fungal warlock meets occult economist - who knows their way around, can make sure you don’t get ripped off trading your carrion for mundane knowledge you could’ve got from any old tree. The Unseen Market has a shady reputation but its influences run deep; every plant is, fundamentally, an obligate marketgoer, trading for most of their goods and to send messages long-distance. The necessity of dealings with the fungal courts is a subject many prefer to remain, well, unseen.