All primordial item textures not explicitly listed here were created by ClockGen and licensed under the CC BY 4.0

Created by FaceDeer and also licened under CC BY 4.0 (as well as CC0 public domain):
dfcaverns_mush_diced_giant_mushroom.png
dfcaverns_mush_giant_hypha.png
dfcaverns_mush_sapling.png
dfcaverns_mush_mycelial_fibers.png

From Minetest default mod:
dfcaverns_jungle_sapling.png