Storied (storeyed). --A term applied to the axial cells and rays in wood when these are arranged 

 in horizontal series on tangential surfaces. Note: The term is applied to particular 

 tissues, e.g., "storied parenchyma" or used in a general sense, as in "woods with 

 storied structure." The presence of storied structure is the cause of the ripple marks 

 visible with the unaided eye. 



Tannins. --A heterogeneous group of phenol derivatives; they appear as yellow, red, or brown 

 substances within the cell, commonly in the vacuoles, but also within the cytoplasm. ' 



Tracheid. - -An imperforate wood cell with bordered pits to congeneric elements (IAWA modif .). 



Vessel. - -An axial series of cells that have coalesced to form an articulated tubelike structure 

 of indeterminate length; the pits to congeneric elements are bordered (IAWA modif.). 

 Syn. Trachea. 



Vessel member or element. - -One of the cellular components of a vessel (IAWA). Syn. Vessel 

 segment (deprec . ) . 



Wood. --The principal strengthening and water -conducting tissue of stems and roots. Charac - 

 terized by the presence of tracheary elements. Syn. Xylem . 



Wood, diffuse -porous. - -Wood in which the pores are of fairly uniform or only gradually chang- 

 ing size and distribution throughout a growth ring (IAWA). 



Wood, early. - -The less dense, larger celled, first formed part of a growth ring (IAWA). Syn. 

 Spring wood. 



Wood, late. - -The denser, smaller celled, later formed part of a growth ring (IAWA). Syn. 

 Autumn wood (deprec). cf. Summer wood. 



Wood, ring -porous. - -Wood in which the pores of the early wood are distinctly larger than 



those of the late wood and form a well-defined zone or ring, cf . Wood, diffuse -porous 

 (BSI modif.). 



Xylem. - -See Wood. 



Description from Esau, Katherine. Plant anatomy, 2d ed. New York: John Wiley & 

 Sons, Inc. 1965. 



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