[throwaway984393]

This is one of the times people need to be discouraged. They should know they're risking their lives if they get into foraging, specifically because they can be easily fooled into thinking it's safe.

As a random aside, a crap-ton of flowers are toxic. Flowers. If somebody hadn't told me that, I'd be eating random ones I find on hikes, because I heard of edible flowers and for some dumb reason I thought they all were.

[alecst]

It's true. It wasn't mushrooms that almost killed me, but what I thought was a carrot. It was poison hemlock. You really can die out there.

It depends on the intentions of the site. If the author is advertising it as a complete guide, then I agree with you: it's incomplete as a guide. If he's advertising it as a starting point -- start with these mushrooms which have a very low risk of harm -- then it's fine in my view.