Figure S1. A maximum parsimony tree of Cortinarius subg. Telamonia nuclear ITS1-5.8S-ITS2 sequences. One of 94 most parsimonious trees is shown and includes samples collected from the oak savanna as ectomycorrhizal roots [labels indicate year, treatment plot (1-9) and focal tree followed by "EMROOT"] and sporocarps (collection number followed by "SPOROCARP"). Sequences for other Cortinarius spp. were obtained from GenBank and are followed by accession number. Cedar Creek clades are indicated by number to the right. Non-parametric bootstrap support from 1000 replicates >50% is shown. Cortinarius californicus was used as the outgroup as it was determined to be basal to this lineage in a broader examination of this group (Peintner et al. 2001). The analysis utilized 701 aligned positions of which 142 were parsimony informative. Maximum likelihood and Bayesian analysis conducted on the same data set produced the same clades. Resolution of higher taxonomic relationships in the Telamonia subgenus was not an objective of this study and not attempted. Table S1. A table of sporocarp abundance and frequency of ectomycorrhizal fungi in oak savanna plots receiving zero, 5.4, or 17 g N m-2 yr-1 collected from 2000-2002. Table S2. A table of the abundance and frequency of species, RFLP, and/or morphotype of ectomycorrhizal fungi colonizing roots in oak savanna plots receiving zero, 5.4, or 17 g N m-2 yr-1 for 2000 and 2001. Table S3. A table of RFLP patterns for all ectomycorrhizal fungi found colonizing roots in an oak savanna in 2000 and 2001.

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