Yellow crust lichen

Yellow crust lichen is a tile in Factorio categorized as a decoration; it represents a patch of yellowish crust-like lichen used to visually alter ground appearance and provide aesthetic variety on the map. As a decorative tile, Yellow crust lichen is intended solely for visual purposes and does not have gameplay effects such as influencing movement, pollution, or production. It is placed as part of terrain decoration and can appear naturally in generated terrain or be applied by editor and decorative-placement systems.