The simplest non-porous and non-striated walled bast fibres are found in mezereum bark (Plate 26, Fig. 4). The individual fibre is very long. It often measures over three millimeters in length, so that in the powder the fibre is usually broken. The wall is non-lignified, white, non-porous, and of uniform diameter.
PLATE 23
Porous and Striated Bast Fibres
1. Blackberry root (Rubus cuneifolius, Pursh.).
2. Wild cherry (Prunus serotina, Ehrh.).
3. Yellow cinchona (Cinchona species).
PLATE 24
Porous and Non-Striated Bast Fibres
1. Sarsaparilla root (Hypoderm), (Smilax officinalis, Kunth).
2. Unicorn root (Endoderm).
3. Marshmallow root (Althæa officinalis, L.).
4. Echinacea root (Echinacea angustifolia, D. C.).
PLATE 25
Non-Porous and Striated Bast Fibres
1. Elm bark (Ulmus fulva, Michaux).
2. Stillingia root (Stillingia sylvatica, L.).
3. Cundurango root bark (Marsdenia cundurango, [Triana] Nichols).