Our database contains information for 50 moss species growing on uprooted trees. Within 160 uprooted trees, we collected data from 260 components (112 - root plates, 77 pits and 71 mounds). Our records were collected in four forest communities occurring in the Karkonosze Mts. (Sudetes, Poland). Uprooted trees were studied in square plots size 10 × 10 m. These plots were established using random-stratified sampling. Within the plot we studied one or more uprooted trees (max. 5 per plot). In addition, to obtain a similar number of uprooted trees in individual types of communities, randomly selected RPM complexes outside the study plots were studied. In the database for each component we attached information on: elevation, component size and age, tree canopy cover, plant community, species number and species cover.