Alnus glutinosa, Alder root nodules containing symbiotic nitrogen fixing bacteria, Wales, UK.

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Photo credit: © keith burdett / Alamy / Afripics
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Keywords: alder, alni, alnus, bacteria, bacterium, britain, british, exposed, february, fixation, fixing, frankia, glutinosa, nature, nitrogen, nodules, relationship, root, roots, symbiosis, symbiotic, tree, trees, uk, winter, woodland, woodlands