Tropicals & Tender Perennials: Lucy has a weird growth, 1 by tikipod

tikipod wrote:
A seller on ebay had a lot of 15 cactus and 5 epi cuttings on ebay for a really good price ($5 plus shipping.) One of the Epi cuttings, labeled as Lucy, arrived with a bump and since it's begun to charge as the cutting has started taking root. Now I recognize the air roots but what is exactly is the growth they are on? Leaf? It looks a bit different from my David W Grant that has begun growing new growth.