Dunham,S.M., Larsson,K.H. and Spatafora,J.W., Species richness and community composition of mat-forming ectomycorrhizal fungi in old- and second-growth Douglas-fir forests of the HJ Andrews Experimental Forest, Oregon, USA. Mycorrhiza 17 (8), 633-645 (2007). https://www.ncbi.nlm.nih.gov/nuccore/DQ371933