I am not been harsh the book has mistakes on nearly every page.
first page tylopilus fellus doesnt contain muscarine, and isnt poisonous, it is just bitter tasting slime.
second page boletus luridus nearly every other book discribes as edible when cooked, not just put a toxic skull and cross bones next to it.
third page boletus rhodoxanthus edible but rare no need for the skull and cross bones.
forth page boletus calopus the bitter bolete is inedibly bitter again no need for the skull and crossbones.
sixth page pepper bolete edible as seasoning.
ninth page strobilmyces strobilaceus edible but rare. porphyrellus porphyrosporus edible both labelled with skull +crossbones
I will stop there but I hope you are getting the picture.
The skull and cross bones is used whether a fungi is inedible, makes you ill or the edibiliy is unknown, but it is what is writen some other fungi that give me the opinion the book should either attacked with tipex or used as tinder;
stropharia semiglobata has no such skull and cross bones, but it is a well known halucenogenic.
Inocybe geophylla again no skull and cross bones , it is deadly.
amanita virosa well known deady. no mention of this at all.