In wild-cherry bark (Plate 23, Fig. 2) the fibre has short, thick, unequally thickened walls, which are porous and striated. Most of the fibres are unbroken.
PLATE 20
Crystal-Bearing Fibres of Barks
1. Cocillana (Guarea rusbyi, [Britton] Rusby).
2. White oak (Quercus alba, L.)
3. Quebracho (Aspidosperma quebracho-blanco, Schlechtendal).
PLATE 21
Crystal-Bearing Fibres of Leaves
1. Coca leaf (Erythroxylon coca, Lam.).
2. Eucalyptus leaf (Eucalyptus globulus, Labill).
3. Senna leaf (Cassia angustifolia, Vahl.).
PLATE 22
Branched Bast Fibres
1. Sassafras root bark (Sassafras variifolium, [Salisb.] Kuntze).
2. Tonga root.