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A Locations of the 24 Pinus radiata trees from which pollen was sampled from. Green pine symbols denote the locations of the trees and the name of the location is next to this symbol. The map is a satellite image of Canterbury based on Google Earth imagery for September 2021. B A cluster of P. radiata catkins (microsporangiate strobili) in September 2021, showing the catkins at pollen-release stage. C Scanning electron microscope (SEM) image of a P. radiata pollen grain; scale bar 10 µm
