Symbiosis between fungi and microalgae gives rise to lichen. Some lichen, however, such as Lobaria scrobiculata, have a unique feature: The fungus establishes a symbiosis with a cyanobacteria, thus requiring water in liquid form to activate photosynthesis. According to a new study, this forces the lichen to concentrate its resources on reproduction in places where water is scarce. For the first time, this study demonstrates the theory of life strategies in fungi.