My brother gave me this orchid to regenerate.
Here are some photos:



What's the yellow stuff? Looks like sponge?

Does medium look ok? Or new medium?




Leaves looks dehydrated.

Should it be potted up to a bigger pot? Had to cut the plastic plug holder out. Took off 3 yellowed leaves.

Thks

The medium looks fine. The yellow stuff is decorative, not sure what it is but if you like the look of it you can put it back on top of the medium once the plant is potted up.

I would put the plant in a large bowl or small bucket of warm-ish water to soak for a few hours at least. Or over night. See if you can get the leaves started to plump back up. They usually recover from this "diva act" but it takes a little while. The roots should be all green.

Pot up in a vented clay pot if you can - hang the leaves over the edge of the pot and don't bury all the roots either. Clay will evaporate water out and keep it a bit more humid around the plant for you. Your problem assuming you're keeping it indoors, is dry air from a/c so water every second day or so, and be sure to mist the roots thoroughly so they turn green, which indicates they've absorbed a lot of water.

The yellow stuff is tree lichen.

Thks, Elaine.
Now what to do about this?


The leaves have perked up, less wrinkled. I've also repotted it into a bigger pot.

Looks like a scar where an old leaf came off. Try to keep it dry, I think that's about all you can do there. Put your thumb over it when you're watering the plant.

If it shows signs of weeping or spreading, I would dab it with some cinnamon on a q-tip. Great anti-fungal remedy but can deter root development, so don't use it unless needed.

Thks, Elaine.