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.
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