Botanist (1878-1951).
Georg Lettau (1878–1951) was a German ophthalmologist and lichenologist who made contributions to the study of lichens in Central Europe. Born in Weißenfels, he initially pursued natural sciences before switching to medicine, maintaining his botanical interests throughout his career. Despite the professional and financial challenges that frequently interrupted his scientific work, particularly during the post-World War I inflation period, Lettau amassed an extensive lichen collection and published numerous works on Central European lichens. His most significant contribution was a comprehensive