Microscopic examination (2.8.23). The powder isorange-yellow. Examine under a microscope usingchloralhydrate solution R. The powder shows the followingdiagnostic characters (Figure 2543.-1) : fragments ofparenchyma including some secretory cells that containmasses of brownish-yellow oil [G] ; reticulate or pittedvessels [B, D]; rare fragments of epidermis (surface view[F]), with cells whose walls are slightly and irregularlythickened [Fa] and scars of covering trichomes [Fb] ;occasional long and flexuous, thick-walled, unicellularcovering trichomes, fragmented and free [E] or attachedto fragments of epidermis [J] ; rare fragments of cork(surface view [A], side view [H]), sometimes covered byepidermis [Ha]. Examine under a microscope using a50 per centV/Vsolution ofglycerol R.Thepowdershowsstarch granules, free or included in parenchymatous cells,usually gelatinised and agglomerated in a starchy paste;occasional ovoid starch granules, often deformed by curing[C], are also present
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