atlantica glauca pendula
And what a lovely tree that is! Unfortunately, there could be many possible causes for "browning, so we'd need a bit more information to be able help you figure this out. Can you send some images of the plant... both close-ups of affected branches and of the whole plant in its location? Also any information about possible changes in growing conditions (weather? fertilization? digging or other disturbances nearby, etc... for example) or if any other plants in the location are similarly affected... any of this may help someone here give you a better idea what might be the situation.