Turritis glabra

Turritis glabra, commonly known as the tower lichen or white-topped rock-lichen, is a hardy annual or biennial herb that thrives in various climates across North America, Europe, Asia, and Africa. Native to regions such as Afghanistan, Alaska, and Albania, it can also be found in parts of the United States including Arizona, Connecticut, and Washington. This lichen grows best in moist, light (sandy), medium, or heavy (clay) soil with a pH between 7.5 and 8, making it adaptable to diverse environments. Its distinctive feature is its compact, tower-like form, which gives the plant its name. The edible parts are its leaves, which can be enjoyed in culinary dishes. With a hardiness rating of 6-9, this lichen can withstand moderate cold temperatures, contributing to its widespread distribution across temperate and subarctic regions.