Bars show the mean ( plus or minus one standard error) priority score (Figure 3D) from 1,000 randomly selected grid cells within each biome (A) or host family presence location (B). Only plant genera classified as EcM host plants were included when calculating host plant family distributions, but both native and introduced ranges are included (see Supplemental information). Within each continent, only biomes and host plant families that cover at least 150,000 km2of land area are shown. Three biomes (tropical dry forests, flooded grasslands, and mangroves) were additionally excluded due to them being inadequately represented (10 samples or less) in the training data used to build the dark taxa richness models. Maps of host plant ranges are provided inFigure S5. Trop. = tropical; temp. = temperate; broad. = broadleaf; grass. = grasslands; shrub. = shrublands.
