Minecraft wiki entry for Glow_Lichen, associated text: Glow lichen generates naturally in the interior of caves (at any height) on the surface of stone, andesite, diorite, granite, calcite, tuff, deepslate, and dripstone blocks that are exposed to air or water sources.[more information needed] It can be found underwater, but cannot generate in the deep dark‌[upcoming: JE 1.19 & BE 1.19.0] biome.