The whole thing is the leaf, The parts are the rachis, petiolule and the leaflet. The rachis is the stem, what you are referring to as the "leaf" is a leaflet and the tiny stem holding them together is the petiolule. Two things come to mind, one is that it is too dry, ZZ plants in nature come from moist environments not dry ones and the other is there is not enough light so the rachis elongate (referred to as "etiolated")They do not need full sun but still need light. These, for some reason are often sold as impervious to neglect or abuse but they are not. The shorties look ok, maybe it was just the change in location that messed with it.

Just stick it in a glass of (room temp.) water so that the bottom 2-4" of the stem are in the water. I don't change the water, I only ADD to it, but I also throw in some bits of charcoal chips (aquarium grade from the pet store) which keeps the water from getting yucky or growing algae. Will take quite some time so pls. be patient, if you've got a clear vase than you can SEE when it roots, otherwise, just take the stem out to check in a couple of months & then every month or so.

Thanks for the help. The photo is from my phone camera, so it is not the best. But you can clearly see the lighter, brighter green new leaves (third rhizome from the right) which unfurled from their sheath just in the past 48 hours!!! No kidding. Before that, it looked like the "sheathed" growth of an unopened rubber-tree plant leaf. This is in addition to the other new shoots that have appeared since I got the plant on May 11. This rapid growth ASTONISHED me, as on-line research kept referring to ZZ plants as "very slow growers." (I am joking with my friends that my ZZ plant somehow aspires to be an oak tree, or that atheletes must be sneaking into my home when I am at work and dumping performance enhancing drugs into its pot. LOL.) I watered it on the 18th and watered it again last night, June 1, and am sticking with watering every 2 weeks Should I water more often? The current pot is about 10 inches across. Last night I purchased one that is about twice that size (the largest one I could find with drainage holes) and will re-pot the plant tonight.

May I pls ask are you new to ZZ plants? I ask 'cause in my experience growing these, sometimes one shoot ages & dies off as the next new shoot appears. I think that may be the case here. The dying foliage doesn't look ill or abnormal, just aged. I also know from experience these put on new growth in Fall & Winter. In my case Sept/Oct & then in February. Is this a variegated plant? The left branch in the pic above looks like it might be. Is that what you mean by green spots? How often are you watering? That lightened color MIGHT indicate overwatering. But the 3rd pic on the paper towel looks just fine, roots & tuber look good, I assume the tuber is hard to your touch. If this all the same plant, it seems you removed the lighter green stem, am a bit confused. Pls don't use a fungicide or anything else, I don't think it's ill. Let's pls allow some time for others to respond.