Epidermal cells of the husks in surface view containing mucilage observed at 400x with Acidified Chloral Hydrate Glycerol Solution.
Source: Elan M. Sudberg, Alkemist Laboratories^[1]

Parenchyma cells seen under polarized light observed at 400x with Acidified Chloral Hydrate Glycerol Solution.
Source: Elan M. Sudberg, Alkemist Laboratories^[2]

Plantago ovata HPTLC ID - Vanillin/H2SO4 Reagent-> 110° C 5 min -> visible light

Psyllium (husk) (Plantago ovata)

Lane Assignments Lanes, from left to right (Track, Volume, Sample):

1. 3 μL Arabinose~0.1% in CH3OH
2. 3 μL Plantago ovata-1 (husk)
3. 5 μL Plantago ovata-1 (husk)
4. 4 μL Plantago ovata-2 (husk)
5. 4 μL Plantago ovata-2 (husk)
6. 5 μL Plantago ovata-3 (husk)
7. 3 μL Plantago ovata-3 (husk)
8. 3 μL Galactose~0.1% in CH3OH

Reference materials used here have been authenticated by macroscopic, microscopic &/or TLC studies according to the reference source cited below held at Alkemists Laboratories, Costa Mesa, CA. 

Stationary Phase Silica gel 60, F254, 10 x 10 cm HPTLC plates 

Mobile Phase ethyl acetate: glacial acetic acid: methanol: water [6/1.5/1.5/1] 

Sample Preparation Method 0.3g+3mL 70% grain EtOH sonicate/heat @~50° C ~ 1/2 hr 

Detection Method Vanillin/H2SO4 Reagent-> 110° C 5 min -> visible light 

Reference see Method Developed by Alkemists Laboratories

Source: Elan M. Sudberg, Alkemist Laboratories ^[3]