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Light microscope images of (A) cross-sections of fifth-order roots from Pometia tomentosa, Barringtonia fusicarpa and Baccaurea ramiflora and a fourth-order root from Pittosporopsis kerrii. Scale bar = 100 μm. (B) Line drawings showing representations of root size and cortex:stele ratio for all root orders. Light purple represents the cortex and dark purple represents the stele. Root and stele diameters were adjusted by the mean diameter for each corresponding order.
