Tillandsia caput-medusae (KAH-poot meh-DOO-sigh) is one of the mainstays in most everyone’s collection. A fantastic shape and appropriate name if ever there was one! As another myrmecophytic, pseudobulbous species, Tillandsia caput-medusae is often not so easy to grow because it rots more easily than many of the others. One way to avoid this, as with these other similar types, is to grow it mounted or hanging sideways to upside down. In this manner, no water will be able to collect in the base of the plant, something that can initiate the rotting process.
The difference is color as seen in the photos can be explained by the amount of light the plant is exposes to. The more light creates a light white colored outcome.