Fig. 27
From: The adjustment of China endemic Heptacodium miconioides Rehd. to temperate zone of Poland
Transverse section of the 4 years old stem of Heptacodium myconioides – the rings, wood semi ring porous. The border of annual ring is designed with blue arrows. Designations: cs – crystal sand; dr – druses; ew -early wood; lw – late wood; me – metaksylem; pr – pith rays; sc – secretion cells; sx – secondary xylem; tr – tracheids; vb – vessels with contact pits; vn – vessels without contact pits. Scale bar 100 µm