Cool faction - there's an elegant simplicity to it. I've found I come up with these big ideas that sound great but are nigh on impossible to practically apply without having to rewrite some fundamental rules for various factions, making it very messy!
The artwork is great - did you do it yourself?
Have you had a chance to test this? It feels like it might be a difficult balancing act between the Remove and Score Spores actions - taking enough Daylight actions vs leaving spores on the board to score in Evening. Curious how that would build up over turns. I suppose the more you recruit, the more you can risk leaving spores in guarded clearings to place and score more of them on subsequent turns.
Only other thing is I wonder if there could be a bit more flavour added as to the warriors, maybe in the Playing the Faction section. Are your warriors sentient fungi? I presume they are from the badass artwork in the bottom right of the board but I was initially a bit confused at the idea of sentient mushroom warriors building non-sentient mushrooms.
That is a very minor nitpick though. Great job!