The impact of artificial mycorrhization with 6 vegetative inocula (produced by research procedures at the Forest Pathology Department at Agricultural University in Cracow) of ectomycorrhizal fungi: Hebeloma claviceps, H. leucosarx, H. longicaudum, H. sacchariolens, H. sinapizans and H. trunkatum on following parameters: the level of mycorrhization of Scots pine and pedunculate oak seedlings, the profile of frequency and types of ectomycorrhizae on these seedlings, the influence of intervention on the growth and development characteristics of shoot and root system was studied. The results of the mycorrhization described above were compared with the mycorrhization with Polish commercial vegetative inoculum of Hebeloma crustuliniforme carried out on the seedlings of the same tree species grown in containers. The assessment revealed that all fungi species representing Hebeloma genus were very good symbionts for pine. The index of mycorrhization of the root system in each case was high and achieved level between 0,86 for H. longicaudum to 1,0 for H. sacchariolens and H. claviceps. The growth and development of oak seedlings in container culture were improved in the highest degree by H. crustuliniforme, H. leucosarx, H. sinapizans and H. sacchariolens.