I had this hedera in the bathroom on the top of a cabinet on a high place close to a ceiling window, ( next to a very happy spider plant ) which was growing in length but at the same time I recently noticed that the leaves close to the soil were falling. So last weekend I grab it down to take a look and very surprised I found a mushroom and three more coming at the centre of the pot, some leaves were wrapped in a kind of web. I kept the soil pretty dry giving small amounts of water. Just to have an idea of what happened here, I am posting this to see if anyone has a good theory about it.

Mushrooms grow from fungus spores that were in the soil. Quality potting mixes are sterile and spore-free. There may also be other problems with the soil used here. I, addition, the spores need constantly damp conditions to develop and flourish so they are often a sign of the soil not drying out sufficiently between waterings.

It is also important that your Hedera Ivy is directly under and close to the ceiling window. Hederas are not low light plants.

The webbing may mean your plant has a spider mite infestation. Spider mites love Hedera Ivies!

If you want to save the plant take some cuttings of the tips of the green stems, then throw the plant away. It looks beyond saving and if it does have spider mite then these could spread to other plants.