of the tongue 6 or are applied or formed in the form of individual successive segments as the material for the panels according to the invention it is advantageously provided that the panel 1 2 are formed of wood wood material mdf hdf plastic material recycled plastics chips with artificial resin or bonded chips particle board and optionally are provided on their front surface or the surface of use 18 and or on their back 24 with a respective coating e g a decorative coating particularly of plastic material or decorative paper furthermore it may be provided in an advantageous manner that the groove 12 and the tongue 6 are formed of the material of the panel or are milled out from it or that the tongue 6 is integrally formed with the material of the panel 1 2 it may be provided that part of the bead or the web 8 is arranged in a countersunk manner within the recess 3 which is formed in the tongue surface 7 the shape of the recess 3 assist in that the applied bead 8 is firmly connected to the tongue surface 7 and does not shear off or loosen when inserting the tongue 6 into the groove 12 as is represented in fig3 the recess 3 may also comprise an area 30.