Shaggy parasol, chlorophyllum rhacodes. Parasol is chlorophyllum procera…. Mushrooms are complex because there are so many of them. When you are starting out try and use the scientific terms because it shows you the relationships and eventually will pay big dividends making sense of the whole mess. If you get the book Mushrooms of western Canada, that has our local species, the author gives a quick translation of the meanings which is way more helpful and descriptive than the common names.
Unlike birds and trees most mushrooms have multiple common names which makes things even more confusing, if that is possible.