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Figure S1.Betula nana biomass in response to 9 years of fertilizer and warming treatments; GH=warming, NP=fertilizer. Above ground biomass is the sum of stem, leaves and inflorescences. Root biomass was not determined. Significant factor effects as determine by two-way anova are indicated; ***P<0.001, and letters above bars denote means that are significantly different as determined by a Tukey's post hoc test. All data is from the Arctic LTER data archive, file # 1982_2000gs81tusbm (Shaver et al. 2000).

Figure S2. Proportion of clones affiliated with ECM fungi genera in clone libraries constructed for Betula nana root tips from the four treatments. Significant treatment effects are denoted by symbols as follows; *P<0.05, **P<0.01.

Figure S3. Unrooted phylogram of the 171 Cortinariaceae-affiliated sequences obtained in this study and two Russula sequences, one Russula-affiliated clone from the current study, and one Russula sequence downloaded from Genbank.

Figure S4. Unrooted phylogram of the 330 Russula spp.-affiliated sequences obtained in this study and two Cortinarius sequences, one Cortinarius-affiliated clone from the current study, and one Cortinarius sequence downloaded from Genbank.

Table S1. Fungi identified in association with plant roots and from sporocarps at the study site near Toolik Lake Alaska.

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