Fig. 4
The weak erosion cell structures of archaeological woods from Nanhai No. 1 shipwreck. a A cell with slight injury (red arrow) of the connection between the cell wall and the cell cavity (Sample 2, TEM). b Another ellipse cell from Sample 3 which presented a thicker S2 layer and no S3 layer (TEM). c Ray cells are intact (arrows) in Sample 5 (LM). d A slight corrosion in ray cells from longitudinal section of Sample 7 (LM)