Cave_Mushrooms_By_Teoxex.zip is a release file of the Minecraft resource pack Cave Mushrooms - Glow Lichen Replacement!, made for Minecraft 1.17, 1.17-Snapshot. It was published on June 11, 2021 and is 0.1 MB in size. For the full description, screenshots and every other version, visit the Cave Mushrooms - Glow Lichen Replacement! resource pack page.
How to install: Put the .zip into .minecraft/resourcepacks (do not extract it) and enable it under Options → Resource Packs.