RHIZOMES AND ROOTS. 



227 



PLATE XCVI1I 



FIG. 108. Powdered Sweet Flag Rhizome (x 240). 



a, Starch grains. 



col, Collenchymatous cells. 



cr f Crystals of calcium oxalate. 



end, Endodermis. 



ep, Epidermis. 



f, Fibres. 



fb, Fibrovascular bundle from stele. 



fvc, Fibrovascular bundle from cortex. 



go, Oil cell. 



la, Intercellular lacunae. 



pc, p'c', Cortical parenchyma in longitudinal and transverse section. 



PC, P'C', The same after treatment with chloral hydrate or potash. 



tc, Crystal cells. 



tr, v, Vessels, etc. 



Q 2 



