>> The point here is: NEVER follow any generic rules (like avoid mushrooms with this or that feature), but reliably identify the type you want to eat!
There's a famous machine learning dataset (cited by at least 50 papers) where the task is to identify mushrooms as "definitely poisonous", "edible" or "not recommended (for eating)":
The following passage I quote from the UCI repository's mirror of the data agrees with your rule:
This data set includes descriptions of hypothetical samples corresponding to 23 species of gilled mushrooms in the Agaricus and Lepiota Family (pp. 500-525). Each species is identified as definitely edible, definitely poisonous, or of unknown edibility and not recommended. This latter class was combined with the poisonous one. The [Audubon Society Field Guide to North American Mushrooms] clearly states that there is no simple rule for determining the edibility of a mushroom; no rule like ``leaflets three, let it be'' for Poisonous Oak and Ivy.
So that's just the mushrooms in two families, and there's no definite rule to identify them as poisonous or not. To be honest, I think I'll make up a rule on the spot: "if it's growing wild, I won't eat it" :0
There's a famous machine learning dataset (cited by at least 50 papers) where the task is to identify mushrooms as "definitely poisonous", "edible" or "not recommended (for eating)":
https://archive.ics.uci.edu/ml/datasets/mushroom
The following passage I quote from the UCI repository's mirror of the data agrees with your rule:
This data set includes descriptions of hypothetical samples corresponding to 23 species of gilled mushrooms in the Agaricus and Lepiota Family (pp. 500-525). Each species is identified as definitely edible, definitely poisonous, or of unknown edibility and not recommended. This latter class was combined with the poisonous one. The [Audubon Society Field Guide to North American Mushrooms] clearly states that there is no simple rule for determining the edibility of a mushroom; no rule like ``leaflets three, let it be'' for Poisonous Oak and Ivy.
So that's just the mushrooms in two families, and there's no definite rule to identify them as poisonous or not. To be honest, I think I'll make up a rule on the spot: "if it's growing wild, I won't eat it" :0