封面说明:油松针叶的横切面
BULLETIN OF BIOLOGY（2001）
Abstract
油松(Pinus tabulaeformis)叶两针一束,簇生于短技上,横切面呈半圆形.表皮和下皮层胞壁厚、胞腔小、排列紧密、外覆较厚的角质膜,气孔器的保卫细胞下陷到下皮层中,同叶肉细胞形成孔下室,在其外方田具喙的副卫细胞拱盖,可减少水分蒸腾.
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