Species compositional data collected in 80 permanently marked plots in a boreal forest in SE Norway, consisting of vascular plants, bryophytes and lichens over the years 1993-2003, 2005, and 2011. There are eight plots in each of 10 blocks, but in 1994 nine plots were devoid of species, therefore the otal number of plots are 1031. In 1994, the plots were experimentally disturbed. The treatments were: T1 (removal of vegetation), T2 (removal of vegetation and the litter layer), T3 (removal of vegetation, the litter, and the mor soil layers), T4 and T5 (removal of vegetation, organic, and bleached soil layers; with T4 bordering intact vegetation on two sides, whereas T5 had a minimum distance of 0.5 m to intact vegetation). Three of the plots in each block served as controls (C). The species are given with full latin names and their abundance in each plot is scored on a scale from 0 to 16.