In both cases the outer skin or epidermis is shedding an old growth, to be replaced by a new one.
Nearly every large tract of old growth mixed woods seemed to contain at least one pair.
With hardy roses the flowers come from fresh twigs on old growth.
And if it be a folly, it is one of an old growth, and is rife among our antipodes as ourselves.
Even the interlaced stems of ivy, when an old growth has covered a wall, have sometimes been utilised to excellent effect.