Yep hens are probably my favorite. Hearty and they hold up well when you cook them. Great on pizza, in spag sauce, on the grill, great sauteed and served in a mushroom omelet etc. One good size mushroom will last a long time and give you plenty of mushroom to cook in different recipes.
Here is a pic of the one i picked the other day. Hobbler. If they are fresh they look like this. They can be white, brown, dark brown and sometimes almost black. All the same thing tho. they will smell fresh and mushroomy. If they are smelly like rotten fish or slimy then they are too far gone so don't eat them. But if they are fresh they will look like this and the pic GMCpaul posted.