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phellogen n.【植物;植物學】木栓形成層 (=cork cambi...

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If the same phellogen functions from year to year , as in beech and oak , then the bark is smooth and consists only of tissue external to the phloem , mainly cork 如在櫸木或橡木中,相同的木栓形成層年復一年的活動,那么樹皮是光滑的,并且僅形成韌皮部的外方組織,主要是木栓(軟木) 。