## 3 Results and Discussion
### The Ability of Fruiting Bodies to Accumulate PAHs  
Other than the fungal degradation ability of the organic pollutants, the accumulation of these compounds in hyphae and even in fruiting bodies cannot be excluded. Table 4 documents the PAH levels in the selected samples of fruiting bodies, documenting low PAH values in the fungal samples, where the data were above the detection limits only for eight of the determined species. The contents of PCBs and PCDD/Fs in the fruiting bodies were below the detection limits. Supplementary Figure S3 also shows anthracene and fluoranthene as the most abundant compounds, confirming the better bioaccessibility of PAHs with low molecular weight compared to the largest molecules. Figure 4A shows the total PAH contents in the fruiting bodies of fungi at the individual sampling points. As confirmed by [PERSON]'s correlation analysis, no significant (\(p<0.05\)) relationship between PAH contents in fungi and soils was observed. The available information concerning the PAH contents in fruiting bodies of fungi is limited, but the values \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline Minimum & 1.01 & 0.91 & 0.57 & 0.98 & 1.33 & 3.20 & 6.37 & 0.39 & 8.37 \\ Maximum & 12.9 & 2.20 & 371 & 108 & 78.9 & 151 & 8.00 & 41.2 & 517 \\ Average & 7.37 & 1.69 & 74.5 & 49.7 & 27.7 & 25.4 & 7.30 & 9.84 & 138 \\ Standard deviation & 3.26 & 0.52 & 139 & 30.8 & 17.3 & 28.4 & 0.59 & 9.69 & 120 \\ Median & 7.08 & 1.82 & 6.10 & 50.8 & 26.9 & 16.4 & 7.42 & 7.02 & 121 \\ MAD 1  & 3.23 & 0.35 & 4.66 & 28.1 & 10.8 & 10.4 & 0.30 & 4.30 & 55.6 \\ LOD 2  & 0.09 & 0.09 & 0.09 & 0.15 & 0.15 & 0.21 & 0.09 & \\ LOQ 3  & 0.3 & 0.3 & 0.3 & 0.5 & 0.5 & 0.7 & 0.3 & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Basic statistics of the PAH contents in fruiting bodies of fungi (ug/kg of dry matter). observed substantially exceeded the levels determined by [PERSON] et al. [73] in a set of edible mushrooms. However, these fungi were purchased in a market and were probably cultivated on unpolluted substrates under controlled conditions. [PERSON] et al. [74] investigated the ability of _Pleurotus ostreatus_ to degrade Delor 103 (a technical mixture of PCBs produced in the 1980s in former Czechoslovakia), where the fungi were able to translocate small amounts of PCBs added to the substrate to the fruiting bodies. The values of accumulated PCBs in the fruiting bodies did not exceed 0.1% of the initial PCB concentration in the straw substrate and did not represent any dangerous PCB levels. Similarly, as in the case of the chlorinated compounds, low accumulation of per- and polyfluoroalkyl substances (PFASs) in the fruiting bodies of _Agaricus_ spp. was recorded by [PERSON] et al. [75]. However, the accumulation of organic pollutants such as PAHs was observed in fungal hyphae, as reported by [PERSON] et al. [76] in the case of mycorrhizal fungus _Rhizophagus irregularis_ accumulating anthracene. In this study, the PAH contents in the fruiting bodies represented between 0.05% and 8.7% of the total content of PAHs in soils, regardless of the sampling location. Thus, the PAH accumulation ability of the fungi seems to be higher than that of the halogenated compounds. Figure 4B presents the total PAH contents in the fruiting bodies according to the individual families, showing an exceptionally high total PAH content in Russulaceae, represented in this case by _Russula atropurpurea_. In this particular case, the total PAH content in the fruiting bodies reached up to 27% of the total PAH content in the soil, indicating high variability in PAH uptake among the fungal species. Moreover, small quantities of PAH degradation products were already identified in several fungal species [77], which were not taken into account in this study. In the Czech Republic, the collection and consumption of wild-living fruiting bodies of fungi are among the most popular hobbies in summer and autumn.