We could see many starch gain,stone cells whose pits were clear,and many calcium oxalate crystals in the root power of Tylophora atrolliculata Metc..These could be regarded as identification...

• 结果三分丹的根维管束周韧型,茎维管束为双韧型,三分丹根粉末中淀粉粒极多,石细胞纹孔明显,草酸钙簇晶多见,这些均可作为其显微特征。结论可为制定药材质量标准提供理论依据。