I had a small collection of Nepenthes growing in a terrarium when I was in high school. My favorite was N. x 'Medusa', a cultivar of the a cross between N. sibuyanensis and N. bellii. My plant looked like a compact N. sibuyanensis and grew equally well in both highland and lowland conditions (the room I had my plants in fluctuated temp. seasonally).
When I left for college I had to get rid of my plants, and that was the last I saw of my, or any N. x 'Medusa' for that matter.

I remember that when I got my N. x 'Medusa' plant 6-7ish years ago, the cultivar seemed to be everywhere in the carnivorous plant nursery trade. No idea where the cross/cultivar originated. My plant threw out a ton of basals, so I doubt that difficulty propagating it accounts for it's scarcity. It seems strange that such a great cultivar just kind of fell off the face of the earth.

I'd like to hear if anyone is currently growing it. I would ask around in the trading section, but I am currently just re-starting to grow carnivorous plants and don't have anything to trade.