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Figure 1  Cluster roots in Banksia serrata growing on Hawkesbury Sandstone hillslopes in the Sydney region. (a) Roots that have grown across a dead eucalypt leaf extract nutrients remaining in the decaying leaf. (b) Clusters of fine rootlets at the tips of roots increase the surface area for nutrient extraction from surrounding soil. Scale bar = 100µm (Scanning electron micrograph courtesy S. Gould).