CELL WALLS 
109 
Various Kinps or CELL WALLS AND BEHAVIOR OF EACH To MICROCHEMICG REAGENTS 
Nature of wall 
Where found 
Reagent and behavior toward same 
Lignocellulose 
(Lignified wall). 
Reserve cellulose. 
Mucilaginous 
modification of 
cellulose. 
Suberized walls. . 
Cutinized walls. . 
Callus of sieve 
plates. 
Silicified walls... 
Parenchyma cells, tri- 
chomes such as cotton, 
etc, 
Woody parts of plants, 
such as stem cells, bast 
fibers, wood fibers, etc. 
Found in certain seeds 
such as nux vomica, 
ignatia, ivory nut, 
date, coffee, etc. 
In various parts of 
plants. 
In cork, wounded areas 
of plants, endodermis. 
Forming outer walls of 
many epidermal cells. 
Plates of sieve tubes. 
Epidermis of Horsetails, 
Grasses, etc.; Diatoms. 
Schweitzer’s reagent dissolves it. 
Chlorzinciodine solution imparts a 
blue or violet color. Iodine solu- 
tion followed by sulfuric acid colors 
it blue. 
Phloroglucin with HCl imparts a red 
color except to bast fibers of flax, 
mezereon, etc, Corallin-soda solu- 
tion imparts a pink color. Aniline 
sulphate with H.SO, colors it a 
golden-yellow. Chlorzinc-iodine 
imparts a yellow color. 
As for cellulose, 
Alcoholic or glycerin solution of 
methylene-blue imparts a_ blue 
color. 
Alcoholic extract of chlorophyll, in 
the dark, imparts a green color. 
Alcannin and Sudan III impart a 
red coloration. Converted into 
yellowish droplets and granular 
masses upon heating with a strong 
solution of KOH. Sulfuric acid is 
resisted. 
As for suberized walls. 
Corallin-soda solution imparts pink 
color. 
Soluble in hydrofluoric acid. 
