Abstract: Truffle ascocarps were collected from a natural forest located in Lahti, Finland (100 km north to Helsinki ) by the help of a trained truffle dog called Siro in Autuman 2006 . By morphological identification , the truffles were identified as Tuber maculatum and Tuber scruposum . The truffle ascocarps were found in soil with relatively high pH value in coniferous forest. Our studies showed that both tuber species prefer the mixed forest with host- trees such as spruce and pine. Samples of the truffle fruit bodies are conserved in the collection of biological materials in the Juva Truffle Center. Further investigation concerning truffle species (DNA) and soil properties will be performed in the coming seasons.

Key words: Truffles