Mycology

There are a few deadly Corts but those tend to be reddish instead of purple. Corts are very under-studied in general so there are are many with absolutely zero info about them (usually because they're nearly identical to several others) and the deadly ones have a delay before they destroy your kidneys so it's generally not a good idea to even try.

Inocybe are generally "days of your body attempting to purge out of every orifice" poisonous which usually won't kill you unless you become too dehydrated.