In a temperate hardwood forest in SW Slovakia, the mistletoe infected 34% of oaks (38% of Quercus cerris, 24% of Q. petraea) with mean density of 2.23 shrubs per tree (range 0-20). The dispersion pattern of the mistletoe on habitable units (trees) was aggregated. The negative binomial distribution performed a good fit of the distribution of the number of shrubs on trees. Within the coenopopulation, only 25.9% of the shrubs were fruiting with mean density of 1.70 fruiting shrubs per infested tree. Shrub size varied between 10-80cm in diameter, and were predominantly observed at heights >16m (on the canopy surface and higher), inhabiting host twigs thinner than 5cm. Hypertrophied host branches (swellings) and end-death of the infected host branch distal to the hemiparasite were found in 21.2% of infested trees. Dry phytomass and surface of the misteltoe shrubs was 1.41kg per host on average (or 1.62km with tumor), and 7.96m2 per host (leaf area - both sides - was 6.54m2 per host), respectively. Reproductive effort was close to 10% on average but might exceed 17% in large fruiting shrubs. Standing crop of leaf-blade chlorophylls was c2.7g per host tree.