The number of species of lichenicolous fungi known from Hungary has almost been doubled in the last decade compared to the first version of an online preliminary checklist compiled by L. L?kös and E. Farkas in 2009. According to various estimations the total number of species might be between 150 and 200, however it is a considerable progress that near 100 species have been registered currently. More than half of these species have recent records. Special attention is paid in the field to collect ‘unusual-looking’ lichens – hoping for discoveries of their parasites. Literature studies are also proved to be useful before field studies concentrating on host species with both known and unknown parasites. Besides these biodiversity studies the lichen secondary metabolite (LSM) content of the host species is also considered. The species richness of various LSM containing host species is compared to find out the relation of the coexisting partners and the effect of LSMs. Our work was supported by the project NKFI K 124341 financed by the Hungarian National Research Development and Innovation Fund.