Lichens are identified as one of the first organisms that could survive on the bare rocks. One of the most important roles of lichens in nature is their physical and biological influences on bedrocks throughout the weathering and soil formation. They are also a relevant indicator for exploring air pollution especially for heavy metals. There is little information about interactions of lichens and bedrocks in Iran and particularly in Sannadaj district, Kurdistan with igneous rocks. In addition, no information is existed about content of heavy metals in the zone between lichen and bedrocks. Therefore, this study was conducted to explore the interaction o lichens and bedrocks in four ingenious rocks (Porphyria diorite, andesite, Tuffs, and Hornblende gabbro) in western Iran. Some chemical, magnetometric (at low and high frequencies, 0.46 and 4.6 kHz, respectively), mineralogical and micro-morphological, as well heavy metals measurements were done on the samples. Lecanora ach. (1809) lecanorceae species is grown on four studied rocks in two sites of urban and rural area. At each site, 15 samples of lichen and soil formed beneath it and 15 samples of associated rocks without cover were collected. The concentrations of Fe, Mn, Zn, Cu, Co, and Cr in lichens and rocks were measured by atomic absorption spectrometry after extraction with chemical extraction. The results showed that except for Co, there was a significant correlation between heavy elements in lichens and parent rocks, indicating the hereditary origin of these elements in lichens. The results of magnetic measurements showed that magnetic susceptibility was decreased in lichen compared to parent rocks, which may be due to the destruction of primary ferromagnetic minerals during weathering processes and their conversion to non-magnetic minerals. Frequency-dependent magnetic susceptibility was significantly higher in lichens samples compared to parent rocks, especially in urban area, indicating the absorption of atmospheric pollutants by lichens. Some chemical properties such as pH, electrical conductivity (EC), calcium carbonate equivalent (CCE), and organic matter (OM) were measured in the samples. To investigate the effects of weathering of lichens on native rocks, a thin section of lichen-rock interface was prepared and examined by polarizing microscope. In these samples, the effect of fungal hyphae penetration was well observed in the Tuffs and the accumulation of iron and clay oxides was also observed. Key Words lichens, heavy metals, igneous rocks, magnetic susceptibility, thin section.