Hello! I find lots of red mushrooms, but I’ve never taken into account just how many until now. There are lots of vibrant red species that I’ve seemed to have taken for granted! Take for example your common fly agaric. Red is beautiful in fungi 
Amanita muscaria (classic)
Russula ‘emetica’ aka “The Sickener”
Cortinarius smithii, a popular dyers mushroom.
Another Cort! There are lots of red cortinarii!
Rosy Gomphidius Gomphidius subroseus
The vivid red stipes of these Xerocomellus atropurpureus boletes
Reishis are red! Ganoderma oregonensis
Colorful and parasitic! Hypomyces lactifluorum (Lobster mushroom)
And the ever important red belted-conk. It’s in the name! Fomitopsis mounceae
