Plate P4. Variable contribution of cell walls to the bulk of vitrinite. 1. T5809; Hole 1109D; 387.86 mbsf. Woody tissue preserved as vitrinite but with the volume of the cell walls close to that of the cell lumens. The corpocollinite within the lumens has a much higher reflectance compared with the cell walls, and its optical properties provide a more reliable measure of coal rank than the optical properties of the cell walls (reflected light; field width = 0.22 mm; vitrinite reflectance [cell contents] = 0.34%). 2. T5809; Hole 1109D; 387.86 mbsf. Same as figure 1, but in fluorescence mode. The cell walls show moderate to strong fluorescence, and moderate positive alteration of the fluorescence was noted on prolonged irradiation. The section is close to being a transverse section of the wood. The larger areas of fluorescence in part indicate sections parallel with a cell wall and in part zones where corpocollinite has not filled the cell lumens (reflected light; field width = 0.22 mm; vitrinite reflectance [cell contents] = 0.34%). 3. T5859; Hole 1118A; 580.69 mbsf. Section of wood where the cell wall material is dominant over the humic corpocollinite cell fillings. In some cases, no cell lumens contain corpocollinite and a much lower reflectance results if all tissues are measured. As far as possible, cell wall materials were excluded from the reflectance data; however, distinction of wall and cell contents is not always as clear as in the fields on this plate (reflected light; field width = 0.22 mm; mean vitrinite reflectance = 0.27%). 4. T5859; Hole 1118A; 580.69 mbsf. Same as figure 3, but in fluorescence mode. Strongly fluorescing cell walls in telovitrinite. The thickness of the cell walls suggests that some secondary cell wall material may be present and that both types of cell wall show similar fluorescence. The color and intensity of the fluorescence is similar to that of suberinite, but the morphology is not that of cork cells (reflected light; field width = 0.22 mm; mean vitrinite reflectance = 0.27%).

Plate P4. Variable contribution of cell walls to the bulk of vitrinite. 1. T5809; Hole 1109D; 387.86 mbsf. Woody tissue preserved as vitrinite but with the volume of the cell walls close to that of the cell lumens. The corpocollinite within the lumens has a much higher reflectance compared with the cell walls, and its optical properties provide a more reliable measure of coal rank than the optical properties of the cell walls (reflected light; field width = 0.22 mm; vitrinite reflectance [cell contents] = 0.34%). 2. T5809; Hole 1109D; 387.86 mbsf. Same as figure 1, but in fluorescence mode. The cell walls show moderate to strong fluorescence, and moderate positive alteration of the fluorescence was noted on prolonged irradiation. The section is close to being a transverse section of the wood. The larger areas of fluorescence in part indicate sections parallel with a cell wall and in part zones where corpocollinite has not filled the cell lumens (reflected light; field width = 0.22 mm; vitrinite reflectance [cell contents] = 0.34%). 3. T5859; Hole 1118A; 580.69 mbsf. Section of wood where the cell wall material is dominant over the humic corpocollinite cell fillings. In some cases, no cell lumens contain corpocollinite and a much lower reflectance results if all tissues are measured. As far as possible, cell wall materials were excluded from the reflectance data; however, distinction of wall and cell contents is not always as clear as in the fields on this plate (reflected light; field width = 0.22 mm; mean vitrinite reflectance = 0.27%). 4. T5859; Hole 1118A; 580.69 mbsf. Same as figure 3, but in fluorescence mode. Strongly fluorescing cell walls in telovitrinite. The thickness of the cell walls suggests that some secondary cell wall material may be present and that both types of cell wall show similar fluorescence. The color and intensity of the fluorescence is similar to that of suberinite, but the morphology is not that of cork cells (reflected light; field width = 0.22 mm; mean vitrinite reflectance = 0.27%). Click on image or number to see enlargement.