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有些双子叶植物的次生木质部中,含有韧皮束或韧皮层,称之谓内函韧皮部。按其在术材横切面上的分布形态,归纳为两种类型:一类称多孔式(又称岛式或马钱子式);另一类称同心式(又称带式或海茄冬式)。笔者在黔东南林区发现有一种大径阔叶材,所具有的内函韧皮部与上述两类迴然不同。这种内函韧皮在肉眼下十分明显,在横切面上表现为与木射线同向的深色线条或细沟,在径切面上呈现出与木射线同向的带状;在弦切面上最清楚,
Some secondary cotyledons of dicotyledonous plants contain a phloem or phloem, called the inner phloem. According to their distribution in the cross-section of the surgical form, summarized in two types: one is called porous (also known as Island or Strychnos); the other is called concentric (also known as belt or sea winter formula). The author found a large diameter broad-leaved forest in southeastern Guizhou, with the inner letter phloem and the two types of back is different. This internal letter bast in the naked eye is very clear in the transverse section of the performance of the ray of light in the same direction with the dark lines or narrow grooves in the radial section showing a ray of the same direction with the band; Most clearly,