The kingdom of fungi is a diverse group of organisms, with approximately 100,000 described species.This makes them the second most species-rich organism group after the insects among eukaryotes. Hence, they can contribute to ecosystems in a plethora of ways. Most commonly, species from the subkingdom Basidiomycota are contributing to the transfer of coal in forests. By doing this, the basidiomycetes can make coal uptake more efficient for a lot of trees and many other plants as well. Moreover, basidiomycetes and wood-living fungi break down lignin, cellulose and organic matter, thereby increasing several nutrient flows and contributing to the decomposition of dead wood. Wood - living fungi require the latter as a substrate in order to thrive, while the more rare/sensitive species also need high decomposition rates of the wood. In the same way, basidiomycetes require organic matter to thrive while the rare/sensitive species often also need old deciduous forests with high continuity. Some species also need high moisture levels. Hence, they tend to grow more frequently in certain regions. Old deciduous forests are declining as a result of heavy exploitation rates, which is alarming since they often contain the old trees and high amounts of dead wood that rare/red-listed species require. Therefore, the main idea with this study was to analyze whether fungi species tend to grow in certain geographical regions and if they occur predominantly in oak forests with high continuity or high amounts of dead wood or not. In order to do this, hypotheses regarding longitudinal and latitudinal distributions were presented, as well as hypotheses regarding the eventual impact of oak forests with high continuity (such as high tree ages and amounts of dead wood) on the total amount of species found. During 10 days, 28 localities were examined for fungi along a transect and the amount of species for each local were summarized  in Excel-files. Regression analyses were used to analyze the hypotheses. The results showed no significant association of species richness with neither the longitude nor the latitude (i.e the gradients). However, the results for both tree age and the amount of dead wood present were significant. These results indicate that higher tree ages and high amounts of dead wood seem to be important factors when it comes to maintaining fungal diversity, red - listed species and regarding finding a suitable replacement for clear - cutting methods in the future. Furthermore, these results question whether moisture plays a big role regarding the dispersal of fungi in different regions, but more studies that evaluate several climate and environmental conditions over longer time periods are required regarding this in the future.