Primary vascular tissue, which is found in all vascular plants, is formed from the procambium.
初生维管组织由原形成层发育而来，在所有维管植物中都有存在。
The results showed that all the cross branch roots of different sizes consisted of periderm, secondary vascular tissue and tetrarch primary xylem.
结果表明：不同直径大小的横走侧根均由周皮、次生维管组织和四原型的初生木质部构成。
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