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Pits can be clearly seen in the walls of epidermal cells.Leaves are amphistomatic or hypostomatic. 水杉屬的多數(shù)表皮細(xì)胞垂周壁明顯彎曲,落羽杉屬和杉木屬有時(shí)微呈波狀,其他屬的表皮細(xì)胞垂周壁直。