Fibres are elanguagated, selerenchyma cells with thick lignified walls the lumen is very narrow. Fibres offer mechanical support. Fibres are of three types surface fibres, wood fibres and bast fibres. Surface fibres are found distributed in the different parts of the plant among the paranchyma cells. Wood fibres are present in xylem, bast fibres are present in pericycle and in phloen.