Fig. 38
From: The adjustment of China endemic Heptacodium miconioides Rehd. to temperate zone of Poland
Transverse section of phloem and bark in two (a) and 5 years (b the last layer of bark absent) old stem of Heptacodium myconioides H2. Designations: ar – annual ring; cc – cork cambium; ck – cork; co – cortex; cr – crystals; fb – sclereid fiber cells of phloem band; np – nonconducting phloem; ph – phloem; pr – pith rays. Scale bars 200 µm