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  • Most leaves show dorsoventral anatomy: the upper (adaxial) and lower (abaxial) surfaces have somewhat different construction and may serve different functions. stomata are more numerous over the abaxial (lower) epidermis than the adaxial (upper). — “Leaf - Wikipedia, the free encyclopedia”,
  • It is known only from cloud forests above 2000 m in Cordillera de Talamanca and Central Volcanic Conservation Area in Costa Rica. A Leaf mines on abaxial side of leaf surface with white square enclosing early mine, arrow pointing to pupal cocoon fold B close-up view of early. — “Phyllocnistis drimiphaga - Wikipedia, the free encyclopedia”,
  • Cone scale base broad, concealing the seeds fully from abaxial view. Cone scale base narrow, with the seeds partly visible in abaxial view. — “Pinaceae - Wikipedia, the free encyclopedia”,

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