Plaque and pigmentation and phloem (commonly known as bark contained in wood) 1. Connotation phloem: phloem bundle or phloem (bark) in wood. There are concentric (short life, such as cigar winter, etc.) and porous (for permanent, such as scorpion). 2. Oil cell or mucous cell: refers to a special cell in the ray or axial parenchyma of the woody dicot. Oil cells or mucous cells refer to a special oily or mucous cell in the broad-leaved tree ray or axial parenchyma, which is identifiable only because the contents are different. The mucus after soaking in water, such as shavings, velvet, and sylvestris, is derived from mucous cells. 3. Crystals and silica: Crystals are present in axial thin-walled structures in the ray line conduit. Silica is an irregularly shaped particle composed of silica, which is often present in ray cells and damages the cutting edge during sawing. 4. Medullary: refers to a bundle of thin-walled tissue that is abnormal in wood (mostly caused by injury), usually due to the formation of a layer that is damaged by larvae. The cross section is darkly spotted and has a dark strip on the longitudinal section.
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