This research also described Physcia as a
moderately sensitive lichens. The relative density,
relative dominance, and relative frequency of
Physcia were higher in plot 1 compared to plot 2
(Figure 6). The absence of Physcia in plot 3 cannot
be explained, considering that this genus is a member
of Physciaceae family that abundantly found in the
cities. Identification until species level probably
generate clearer population pattern, because species
of Physcia show different sensitivity to air pollution.
In Serbia, P. tenella is sensitive lichen, while P.
adscendens is tolerant (Stamenković et al. 2010).