Trunks of some of the aged tree species appear to be composed of several fused trunks. Is it a physiological or anatomical abnormality? Explain in detail.

Trunks of some of the aged tree species appear to be composed of several fused trunks. This is anatomical abnormality.

It is an abnormal type of secondary growth, where a regular vascular cambium or cork cambium is not formed in its normal position. In this case cortical and medullary vascular bundles are formed. This gives rise to the additional or accessory vascular bundles giving an appearance of additional trunk which appear to be fused trunk.