The radiating parenchyma is only observed around the fvb of the central cylinder. It may be well developed all around the fvb OR present only around the vascular part and is best observed from TS of the central zone.
[legend of the figure]
A fibrous vascular bundle (fvb) with its different characters. AL = auricular lobe; AS = auricular sinus; dcap = fibrous dorsal cap; MS = median sinus; RP = radiating parenchyma; TP = tabular parenchyma; vasc = vascular; vcap = fibrous ventral cap.
a: Sagittata;
b: Cordata;
c: Complanata;
d: Reniforma;
e: Lunaria;
f: Vaginata.