Fig. 11.—Cross section of stem bark of Prunus Pennsylvanica.

Fig. 11.—Cross-section of the stem bark of Prunus Pennsylvanica magnified about 75 diameters.
a, cork in layers, represented as separating from the middle bark,
b; c, irregular or tortuous sclerenchyma fibres;
d, medullary ray;
g, fissure between medullary ray and bast;
h, compressed sieve tissue;
i, young bast tissues near cambium;
k, cambium zone;
l, a duct in the wood.

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

Fig. 11.—Cross section of stem bark of Prunus Pennsylvanica.