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

中层组、绒毡层组隔维管束异常均是雄性败育因素。

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

栅栏组富含含盐液泡泡，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维管束间具有旺盛分裂能层细胞。

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

方法利用微镜观察其根、茎横切面结构组与根粉末特征。