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Visualization of microorganisms associated to the rhizosheath-root system of speargrasses. SEM micrograph showing bacterial cells present at the surface of both root hairs (a–c) and sand grains (d–f). Rh, root hairs: projection from the epidermis cells; *: flaky or coating materials; red-arrow: coccus-shaped bacteria; yellow-arrow: rod-shape bacteria; white-arrow: filamentous bacteria or fungal hyphae. Note the different scales on the SEM photographs
