Does the genus of a mushroom have enough information about it, without the species?
Let's say I wanted to identify a mushroom (when picking) to see if I can safely pick and later eat it. Let's say I successfully identified the mushroom's genus (using an identification key guide book such as this one). Is this enough to determine whether or not the mushroom is edible? Is it enough to determine other general information about it? Furthermore, is it enough to determine whether it is good-to-eat (as in not bitter)? For example, I know that some edible mushrooms have other mushrooms very similar to them that are not edible or that are bitter and difficult to cook.
In other words, are there any genuses of mushrooms that generally are recognized as edible but in reality contain both edible and inedible species of mushrooms in them?