Here's a breakdown:
* Miscellany: This is a noun that refers to a collection of various items.
* Miscellaneous: This is an adjective that describes something as being made up of different things.
Examples:
* "The miscellaneous items in the box included a rubber band, a broken pencil, and a half-eaten cookie."
* "There was a miscellaneous collection of books on the shelf."
Essentially, when you see "miscellaneous," think of it as a shorthand way of saying "various," "assorted," or "diverse."