Abstract
This paper gives a survey of biodiversity of Northern red oak (Quercus rubra L.) stands in Rogów Arboretum on the background of environmental data. Northern red oak is found throughout much of the eastern United States and southeastern Canada and occurs on sites with a wide variety of soil types and topographic positions. In Poland, it is considered an invasive plant, dangerous to the native flora. During the study, 36 taxa of vascular plants, mosses, and liverworts; 40 taxa of fungi; and 112 taxa of invertebrates were found.