皮刺比刺要小了许多：它们是这些植物外层的附属物，看上去像皮肤的表皮，其下还有亚表皮层。
Prickles are smaller than thorns: they are sharp outgrowths of the plant's outer layers, the skin-like epidermis, and the sub-epidermal layer just beneath it.
表皮细胞外壁在花粉成熟时期略有增厚，且具小刺状突起。
The outer wall of epidermal cells with spininess becomes slightly thick at mature pollen stage.
表皮细胞外壁在花粉成熟时期略有增厚，且具小刺状突起。
The outer wall of epidermal cells with spininess becomes slightly thick at mature pollen stage.
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