Olona fibers are exceptionally long. This also enhances their utility because long fibers are less likely to separate than short ones. The pink color indicates the absence of lignin. Olona fibers are found in the outer region of the stem where hau and wauke fibers are located. However, the fiber-like cells of Olona are actually laticifers .
Laticifers are highly elongated cells which produce a fluid called latex.
Many plants with laticifers produce a viscous white latex. If you wound the leaves or stem, a milky white latex exudes from the cut. Note the two large cells with thick walls. Compare these with the walls of adjacent cells. The thick cell walls are translucent.