Prunus. Fig. 6.—Longitudinal section of inner bark of Prunus Mahaleb.

Fig. 6.—Tangential section through bast layer of Prunus Mahaleb, showing medullary rays and compressed sieve tissue. Magnification about 230 diameters.
a, compressed sieve tissue;
b, crystal cell;
c, ordinary parenchyma cell of medullary ray;
d, compressed sieve tissue;
e, fissure between medullary ray and sieve tissue.

This image is from Structure of our Cherry Barks in the September issue of the American Journal of Pharmacy, 1895.