Maximum-likelihood phylogram presenting members of group 1.1c Crenarchaeota. The sequences found in this study are shown in bold script. The first two letters in the sample codes represent the tree species (Ps, P. sylvestris; Pa, P. abies; Bp, B. pendula; Ag, A. glutinosa). The middle two letters of the mycorrhizal sample codes represent the fungus (Pi, P. involutus). The last two letters represent the sample type (Fr, fine root; Mm, mycorrhiza). The numbers (1, 2, or 3) after the OTU code indicate the primer combination used to obtain the OTU. Values for nodes with over 50% bootstrap support are shown. The tree is rooted by Euryarchaeota.