Your plant had crown rot. It happens when water gets into the crown and temps are cool. Best to toss the plant and start over. Don't mist phals or get any water in the crown. You could wait and the plant will send up a keki from the stub but, IMO its not worth the trouble to wait a few years for a new plant to grow, unless this was a valuable plant. I'd go shopping. Jane

The roots of phalaenopsis are green because they contain chlorophyll and help photosynthesize for the plant. This is why most people use clear/transparent plastic orchid pots, so the roots can be exposed to sunlight, along with the leaves. This helps them produce more food to grow stronger and healthier. I would say that it would be best to repot back into the clear pot it came in. Tho going up another pot size would be fine too. Phalaenopsis don't really get any bigger than they already are once they're full grown. If I were to recommend a pot, I would have to go with the Oxygen Core Dual™ Pots. These wonderful pots are sold online by RePotMe. I bought a couple of these pots to try out, and I loved them so much that I went and ordered some more. They sell them in a range of different sizes. The 5.5" pots are just the perfect size for most Phals. The inner net pot holds all of the media (I use 50% sphagnum moss & 50% bark/perlite/charcoal blend). This replicates the perfect humid environment for you orchid's roots, while giving them plenty of fresh air. All of my orchids love these pots. :) ^ You may notice the white nylon string that I have running thru the drain holes in the outer pot. I have them tied down the the wooden table so that they can't move. I live in Tornado Alley, and during Tornado Season, we can get some pretty fierce thunderstorms rolling thru. Before I did this, my pots used to get knocked around all the time. Which gets old pretty fast. This has proven very useful in keeping my 'chids secured and in one place. If I need to handle any of my plants, the I just remove the inner net pot(s). Just be careful if any new roots happen to be growing out of the net pot, because they can be easily broken.

Thanks, all for responding. I checked the plant again and I see tiny droplets along some of the leaves (not all), but no signs of scale or mealies. No other plants are close by...it sits by itself in a separate window. I will keep a watch just in case I missed some "critters", or other infestation. I definitely don't see ants anywhere on the plant feeding on this stuff. But a very interesting fact that I didn't know, so thank you!

Wrinkly leaves mean dehydrated plant. If your roots are fine, you're just not giving it enough water. Because my phals are all in chunky bark mix and my environment is pretty dry, I don't worry a bit about letting my plants sit in a deep bowl of water for up to 45 minutes, twice a week. They drain fast and dry quick. Now, if you think your root ARE damaged or rotten, you have to be a little more careful about watering. Clean off anything dead and put in fresh mix. I've encouraged phals with few/no roots to grow more by putting a ring of sphagnum moss around the top of the plant (without actually touching the base of the plant, as that my promote rot), and keeping that moist. It'll prevent evaporation, and keep a humid, not soggy, environment around the roots that are there, and promotes root growth.