Wood rays are vascular rays located in the secondary xylem within the formation layer, formed by the original cells of the rays. If wood rays are stacked, sometimes wave marks can be seen on the wood chord section; wood rays are responsible for lateral transport and storage of nutrients, and can form intrusive fillings, gum-like substances; wood rays of broad-leaved trees are more than coniferous trees Thick and big, the value of identification is also great. In terms of wood identification, the characteristics of wood beam width, density, and type of ray organization are important basis for accurately identifying wood from a microscopic perspective
1. The obviousness of the ray depends on its width and contrast with the surrounding tissue color. 1. Invisible or not obvious to the naked eye, such as sweetgum, coniferous wood, etc. 2. Visible or obvious under the naked eye, such as Duckfoot. 3. It is obvious to the naked eye, such as Qinggang, Quercus acutissima, etc.
2. Width refers to the number of cells at the widest ray on the chord plane. There are three levels: narrow, medium and wide.
1. Very fine by scale
2. Compare the width of the wooden ray with the size of the tube hole: under the microscope, the width is often expressed in the number of cell rows. The widest wood beam width ≥ the maximum tube hole diameter, such as star anise, maple, etc. The width of the widest wood beam is less than or equal to 1/2 the diameter of the largest tube hole. Such as boxwood, fragrant wood and so on. The widest beam width <the largest tube hole diameter, such as dense flower tree, dense scale purple golden bull, etc. The widest wood beam width ≥ the maximum tube hole diameter, such as star anise, maple, etc.
3. Multi-row and single-row parts are of equal width. This feature should be observed on the chord section.
3. Height refers to the height of the ray on the chord plane, including single and multiple rows. There are four levels: low, medium, high and very high. 1. Most of the rays are less than 1mm, and those less than 0.5mm account for about 1/4 of the total tree species, and those greater than 1mm account for about 1/4. Therefore, when the naked eye enlarges the lens, it can be higher than 2mm. 2. The ray height can still be expressed in cell numbers under a microscope.
4. Density ray density: refers to the number of rays in the range of 1mm, which can be measured on the cross section or chord section, generally on the chord section. Divided into four levels: rare, slightly rare, slightly dense and dense.
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