The texture is amazing.

Is that dried out honeycomb in the bg?

These are actually called “flowerpot parasols”, complex Leucocoprinus brebissonii. They’re a harmless saprophyte originally from the tropics, they love orchid bark, a common component of potting soil, which is why they show up in flowerpots so often.

You have honeycomb in your monstera?

Unfortunately I am no expert, but the experts all ask for pictures of both the underside and from the top like that for identification.

Not an expert, but is that potted plant a tropical by any chance?

I had something v similar if not the same pop up in a 5yo hot pepper plant. Turns out it was a sign of impending doom for that (and most any tropical) plant.

Check with a real botanist, but I would suggest re-potting it asap.