Prunus 2. Fig. 1.—Cross-section of bark of Prunus demissa.

Fig. 1, transverse section of the bark of the Pacific Coast form of Prunus Virginiana, magnified 100 diameters;
a, periderm;
b, sclerenchyma fibres in cortex;
c, a secondary medullary ray;
d, bast fibres;
e, a primary medullary ray;
f, later formed phloem elements;
h, cambium tissue.

This image is from Some Further Observations on Cherry Barks. in the December issue of the American Journal of Pharmacy, 1895.