In this paper the general pith behaviour including the lacunae formation in the hollow culm internode and development of string like processes from nodal partition walls in Dendrocalamus giganteus Munro have been discussed. The young shoot in D. giganteus is solid, conical and covered with imbricating sheaths. It consists of solid massive tissue which ultimately develops into hollow internode with transverse partition wall without any outgrowth. The young shoot in solid state appears as dark coloured cross bars separated by light coloured parenchymatous tissue. The dark coloured zones become the nodal partition walls. The lacuna’develops through disintegration of coloured zones. The string like process that develops from the nodal partition wall is an abnormal behaviour of the pith. It consists of vascular bundles and parenchymatous tissue. The vascular bundles are of type III of Grosser and Liese (1971).