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Tumour  (Or Tumor)   [ Biology  -  Phytopathology  ]

Dictionary of botanic terminology
index of names

Synonym: Cancer, Cancerous growth
  An abnormal mass of undifferentiated cells within a multicellular organism that results from excessive cell division; term often used to designate cancer.  
A tumour is an abnormal tissue swelling or mass that results when cells divide more than they should or do not die when they should and continues to grow after the stimuli which initiated the new growth cease.
Tumours perform no useful body function and can interfere with vital body functions and absorb nutrients needed elsewhere. They can be malignant (cancerous), which means they will grow rapidly and spread to other parts of the body or cause more tumours to form elsewhere, or be benign, which means that they will generally grow much more slowly and stay put in one area.

A plant Tumour can be defined as a 'massive cellular growth without cellular differentiation'.

Plant tumours are most often seen as 'galls'.







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