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Olive tree leaf trichomes (Olea europaea). Plant trichomes are fine epidermal outgrowths that have diverse structure and function (e.g., hairs, scales, and papillae). These Olive scale-like peltate trichomes that often overlap prevent evaporative water loss during dry or windy conditions and help the Olive tree survive in hot and seasonally dry climates. Often trichomes are used for plant protection from insects. SEM X40.