In this podcast interview, which is in Swedish language, I talk with ecologist Janolof Hermansson, who has for many years inventoried and studied lichens both in Dalarna in Sweden and in Russia about: - what lichens are - why it is so difficult to define their composition without modern technology - what conditions they require to develop - what their function in our ecosystem is - how human activity impacts lichens - what you need to go on your own lichen discovery adventure - what it needs to increase our knowledge on lichens