We have studied the spatial distribution of the long-lived granules from a population of 346 granules located in a photospheric region 37"x37". Our study 13 based on an exceptional sequence of photos taken by R. Muller at the Pic-du-Midi Observatory on May 16, 1979. We have determined the lifetime of all the granules situated in this rectangular photospheric region. For the determination of the mean lifetime (15.5 min) we have used a method recently developed (Alissandrakis et aI.. 1987), that permits to define accurately the mean lifetime. Finally we have studied the spatial distribution of the long-lived granules. As long-lived granules we consider all the granules with lifetime greater than the mean lifetime of the population. We found that the long-lived granules are not randomly distributed in the area under study, but they are located in well defined regions with mean length 0"-10" and mean width 2"-4". This result seems to confirm our suggestion (Dialetis et al. 1986) that there are at least two families of granules as for as their lifetime is concerned. We discuss the possible causes of the existence of regions characterized by slower evolutionary process.