Hinterland Trading Caput Medusae Air Plant Tillandsia Cool and mysterious this cool guy is great in a large open air terrarium or simply perched on a windowsill. Caput Medusae are a rich grassy green with delicate peach fuzz covering the base and stretching up the arms. Measuring 1" at the base and varying from 2" to 4" height. They produce a showy pair of brightly colored red and blue flowers