10.22376/ijpbs.2019.10.1.p1-12 Volume 4 Issue 2 2013 (April - June) The present investigation provides the effect of combined treatment of gamma rays and SA (Sodium Azide) on the morphology of lessThan i greaterThan Linum usitatissimum lessThan /i greaterThan . Fasciated plants were obtained in M lessThan sub greaterThan 2 lessThan /sub greaterThan and M lessThan sub greaterThan 3 lessThan /sub greaterThan generation. Various widened and flattened organs were found such as fasciated stems, abnormal branches arising from fasciated stems, broad and abnormal leaves. The enhanced activity of apical meristem and cambium resulted in a significantly increased circumference of the stem resulting into increasing number of leaves, buds, flowers, fruits and seeds. Moreover the size of fruits and seeds were much bigger than control. ALKA AND M.Y.K. ANSARI Linum usitatissimum, gamma rays, SA, Fasciated mutant. 1196-1200