The haustrum structure of the two were similar and both were composed of parenchyma and spiral vessel.
北桑
较薄，脉发
，无栅栏组织和海绵组织的分化。
The haustrum structure of the two were similar and both were composed of parenchyma and spiral vessel.
北桑较薄，脉发，无栅栏组织和海绵组织的分化。
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