Fig

Rays occur in two forms: Uniseriate, homocellular rays with upright cells and larger heterocellular rays (2-4 square or upright marginal cells) with 3-4 cells in width (Fig. 4 and 5). Bordered pits (piceoid) with slit-like apertures occur on uniseriate rays and on marginal ray cells of large rays. They are arranged in axial uniseriate rows (Fig. 6).

bpit bpit

Fig. 3. Radial cell walls of tracheids with bordered pits with oval and scalariform apertures. Amborella trichopoda, radial sec-

Fig. 1. Vessel-less xylem with indistinct growth zones. Stem of a shrub, moist forest, tropical climate, New Caledonia. Amborella trichopoda, transverse section.

Fig. 2. Thin-to thick-walled tracheids. Parenchyma cells (axial and radial) are filled with dark staining substances. Amborella trichopoda, transverse section.

Fig. 3. Radial cell walls of tracheids with bordered pits with oval and scalariform apertures. Amborella trichopoda, radial sec-

dss bpit

Fig. 2. Thin-to thick-walled tracheids. Parenchyma cells (axial and radial) are filled with dark staining substances. Amborella trichopoda, transverse section.

dss bpit

Fig. 4. Uniseriate and multiseriate rays, 3-4 cells wide. Amborella trichopoda, tangential section.

Fig. 5. Heterocellular ray with >4 marginal upright cells. Amborella trichopoda, radial section.

Fig. 6. Upright ray cells with bordered pits (piceoid) in uniseriate axial rows. Amborella trichopoda, radial section.

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