Yohimbe bark : its history and identification in commerce / by J. Small & F.M.J. Adams.

  • Small, J., active 1922.
Date:
[1922]
Catalogue details

Licence: In copyright

Credit: Yohimbe bark : its history and identification in commerce / by J. Small & F.M.J. Adams. Source: Wellcome Collection.

    10/20 (page 10)
    ( ) TABLE OF D j — P. Yohimba. P. macroc -1 Microscopic Characters 1 4-15 Mm. Thickness 4-20 Mm. Outer Surface Light or dark brow | Colour Grey to reddish brown Surface Longitudi nal f ur- Often scraped; lcjj rows; many trans¬ verse cracks, l-2Cm. and ridges; fell transverse crack Jj Lichens apa 11 Grey or white; few or many Grey, usually num« jj Cork Thin, adhering closely Thin or thick, of j tachable Inner Surface Dark brown or Colour Reddish brown Surface Finely striated and ridged Ridged and wrinkl ||| Fracture Short, fibrous, some¬ times splintery on inside,surfaces soft, velvety As for P. Yoliimba j< Microscopic Characters Cork 1/4 to 2/3 Width of Cork 1/20 to 1/3 Width of Cortex No. of cells wide 3-30 2-40 Colour Grey to dark brown Dark brown Phelloderm 4-20 No. of cells wide 2-12 Colour Yellowish grey to reddish brown As for P. Yohimba J& Cortex 1/6 to 1/1 Width of cortex 1/16 to 1/1 Width of Bast As for P. Yohimba Colour Yellowish brown to reddish brown Medullary Rays 1-4 eells 1-3 cells T. S. inner bast Width Regularity T. S. outer bast Width Straight Straight 1-3 cells 1-3 cells Regularity Diverging, cells elon- Curve irregular] ill gate tangentially tangentially ;T Ends Straight or curved Often distorted, c ft L. S. tangential Width 1-3 ceils 1-3 cells Depth 6-35 cells 5 20 cells Shape Narrow spindle or Somewhat rect rectangular slightly taperinnH 5-20 cells L. S. radial Depth 8-30 cells Bast Fibres Grouping Usually in one-cell Radial rows SI! i wide rows,1-3 occur, common, not “ it “Twinning” in tfr “ b e a d e d, no “twinning” in outer bast bast Diameter 22-39 fi 22-33 fa Length 0-7-1-6 Mm. 0-61-9 Mm. Shape T.S. Rectangular Rectangular L.S. Long spindle, pointed ; . Spindle, with s i '! ends ends Lumen Punctiform or some¬ times linear Linear, or somel KUjh