ADJ produced or growing on the undersurface, esp (of fern spores) growing on the undersurface of the leaves 下生的; 尤指(蕨类孢子)叶子底面生长的 [botany]
hypogenous cotyledon地下子叶
ADJ（形容词） produced or growing on the undersurface, esp (of fern spores) growing on the undersurface of the leaves 下生的; 尤指(蕨类孢子)叶子底面生长的 [botany]