title: [Observation on trachea inner walls of six species of Sect. Stenophora by scanning electronic microscope].
abstract: OBJECTIVE
  To probe and identify the ultramicro characteristics of trachea inner walls(TIW) of six species of Sect. Stenophora, i.e., Rhizoma Dioscoreae Spongiosae, Rhizoma Dioscoreae Hypoglaucae, Rhizoma Dioscoreae Futschauensis, Rhizoma Dioscoreae Gracillimae, Rhizoma Dioscoreae Tokoro and Rhizoma Dioscoreae Zingiberensis, by scanning electron microscope (SEM).
  
  
  METHODS
  The vertical microscopical sections are stuck on the platform of species and metal plated. TIW were observed and photographed by SEM.
  
  
  RESULTS
  The ultramicro characteristics of TIW, i.e., the smoothnesss of TIW, the existence of separation bands, the density, arrangement types, shapes and sizes of pits, etc., can be seen clearly under SEM. Further, there exist differences in the ultramicro characteristics of each species.
  
  
  CONCLUSIONS
  The above six species of crude drugs can be identified according to their ultramicro characteristics of TIW. SEM can be used to study the ultramicro characteristics of crude drug rhizomas thus creating a new area for identifying crude drugs.
authors.affiliation: Zhejiang Provincial Institute for Drug Control, Hangzhou 310004.
authors.forename: W
authors.initials: W
authors.lastname: Zhao
authors.forename: Z
authors.initials: Z
authors.lastname: Guo
mesh_terms: D019684:Magnoliopsida / Q000145:classification / Q000648:ultrastructure*; D008855:Microscopy, Electron, Scanning; D010598:Pharmacognosy; D018547:Plant Stems / Q000648:ultrastructure; D010946:Plants, Medicinal / Q000145:classification / Q000648:ultrastructure*; D013045:Species Specificity