vascular bundle

Male-sterility mainly results from the abnormality of mesospore,tapetum tissue and vascular bundle.

中层、毡层及药隔维管束异常均是雄性败育的因素。

Palisade tissue is rich in saliferous vacuoles, while vascular bundle sheath is obvious.

栅栏富含含盐液泡泡，维管束鞘明。

Collateral or bicollateral vascular bundle, developmental pith and medullary ray are obvious.

髓部发达，髓射线明。

Interfascicular cambium A single layer of actively dividing cells between the vascular bundles in stems.

束间形成层是位于茎的维管束间的具有旺盛分裂能力的一层细胞。

ResultsThe root of Tylophora atrolliculata Metc. had amphicribral vascular bundle, however steme had bicollateral vascular bundle.

法用微镜观察其根、茎的横切面结构与根粉末特征。