Abstract
The paper contains a list of 38 lichen species collected on tree fall disturbances (pit-mound-root plate complexes) in the Polish part of the Karkonosze Mts. Seven of these species are threatened in Poland: Arthrorhaphis grisea, Bacidina arnoldiana, Cladonia bellidiflora, Lichenomphalina umbelifera, Porpidia cinereoatra, Psilolechia clavulifera, Trapeliopsis gelatinosa, and two are protected by Polish law: Parmeliopsis ambigua and Pseudevernia furfuracea. Root plates with uprooting pits and mounds create conditions for the development of lichens characterized by very different habitat requirements (photolichens, hygrolichens, skiolichens). Presence of these microhabitats in the forest communities is important for preserving diversity of lichens. Among pit-mound-root plate complex the best conditions for the development of lichen biota are on the root plates. Tree fall disturbances are important microhabitats for pioneer crustose lichens.