 Suillus collinitus is found throughout Europe . It is an ectomycorrhizal fungus , forming mutually beneficial symbiotic relationships with several species of pine ( Pinus ) . These include several two @-@ needled European species of pine : Aleppo pine ( P. halepensis ) European black pine ( P. nigra ) , stone pine ( P. pinea ) , and Scots pine ( P. sylvestris ) . The fungus favours limestone soils . S. collinitus is thermophilic , commonly occurring in southern Europe . It is rarely seen in more northern regions , such as the British Isles and Poland . It is red @-@ listed in Denmark as near @-@ threatened , and in Estonia as endangered . It has also been collected in Iran . 
