Identification of raw herbs
Character identification
Root tube, trough, or irregular roll, different sizes, generally 3-10cm long, 0.5-2cm in diameter, 1-3mm thick. The outer surface is yellowish or grayish yellow, rough, with irregular longitudinal cracks, easy to scale-like exfoliation; the inner surface is yellow-white, with fine longitudinal stripes. Quality crisp, easy to fold, folding section inside and outside two layers; inner gray. Gas slightly, taste slightly sweet, after bitter. It is better to use a thick, thick, neat, no wood core and debris.
Microscopic identification
Cross-section of root barks: The thicker layer of the skin, there are 2-3 cork tissue bands, the innermost cork layer is a complete ring zone, the outer ones are interlaced, and the decadent screening tubes and ray cells can be seen. The phloem is wider, accounting for half the thickness of the root bark; fibers are scattered in individual or few bundles, occasionally seen in stone cells; ray width is 1-2 rows of cells. This parenchyma cell contains starch grains, and some contain calcium oxalate crystals.
Powder characteristics
1, beige.
2. Calcium oxalate sand crystals are scattered everywhere, and some parenchyma cells are filled with sand crystals to form sand grains.
3, fiber is often connected with ray cells; fiber spindle or spindle-shaped, length 110-230μm, wall thickness 3-11μm, woody or micro-wood, with sparse oblique holes, and some cells containing yellow brown.
4. The starch granules are round or oval in shape; the granules are composed of 2-8 granules. In addition, there are stone cells, cork cells, and parenchymatous cells.
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