CELL TYPE CYTOPLASMIC FEATURES CELL WALL FEATURES 3-D GEOMETRY

Tracheid
Subcategories based on location and geometry
 
Name Location
Axial In conducting tissue of secondary xylem
Ray In rays of secondary xylem, often at upper and/or lower margins
 
 
 

 No cytoplasm at maturity
Diameter of lumen is about the same as thickness of cell wal
 		 Uniformly thick secondary cell wall with circular or elliptical bordered pits
Cell Wall / Lumen Ratio about one
 
Axial 
Transverse Isodiametric
Longitudinal  Very elongated cylinder with tapered ends

 
Fiber-tracheid
Intermediate form between Fiber and tracheid cell		 No cytoplasm at maturity
Diameter of lumen is slightly less than thickness of cell wall		 Uniformly thick secondary cell wall with elongated pit canal that extends slightly beyond a circular pit chamber.
Intermediate Cell Wall Lumen Ratio
Transverse Isodiametric
Longitudinal Elongated cylinder with tapered ends