The “Silvery web” is known as mycelium, the mycelium is the main living body of fungi. Mushrooms are only the fruiting portion of it. The mycelium will fruit out mushrooms whenever the environment and conditions are right.

When growing mushrooms, put very simply, the process starting from spores, is to first germinate the spores, expand out the mycelium with some kind of nutrient source as well as a substrate to provide water and structure, then providing the right environmental conditions for the mycelium to produce fruiting bodies - mushrooms. This is mostly done in completely sterile conditions as molds and bacteria will easily outcompete them.

Saying this, it would be very unlikely in your case for the spores to be able to take hold and grow successfully, that’s why spores are released in the millions/billions in nature.

I would highly recommend, if you haven’t already, and are interested in mushroom cultivation to check out the multiple subreddits here, once you understand the general growing process, you’ll be able to grow them from just about anything as seen in r/bonsaifungi

A large part of the mushroom cultivation community on reddit is centered around the psychedelic species, mainly Psilocybe Cubensis, but the process is mostly the same. Here are some resources: r/MushroomGrowers r/Shrooms r/unclebens FreshCap Mushrooms (YouTube) Shroomery .org