The Pr0.50Sr0.50CoO3 perovskite exhibits unique magnetostructural properties among the rest of the ferromagnetic/metallic Ln(0.50)Sr(0.50)CoO(3) compounds. Existing reports are largely controversial. We have determined and described its structural evolution, which follows the Pm3m -> R3c -> Imma -> 14/mcm transformations. The structural changes have been thoroughly described. The results are confronted with distinct nonconventional properties and spin-lattice coupling effects in another half-doped cobaltite based on praseodymium, Pr0.50Ca0.50CoO3. The Imma -> 14/mcm symmetry change is responsible for the unexpected second magnetic transition.