a mushroom (probably russula brevipes) parasitized hypomyces lactifluorum resulting in lobster mushroom . typical mushrooms fruit bodies of members of order agaricales, type genus agaricus , type species field mushroom, agaricus campestris. however, in modern molecularly defined classifications, not members of order agaricales produce mushroom fruit bodies, , many other gilled fungi, collectively called mushrooms, occur in other orders of class agaricomycetes. example, chanterelles in cantharellales, false chanterelles such gomphus in gomphales, milk-cap mushrooms (lactarius, lactifluus) , russulas (russula), lentinellus, in russulales, while tough, leathery genera lentinus , panus among polyporales, neolentinus in gloeophyllales, , little pin-mushroom genus, rickenella, along similar genera, in hymenochaetales. within main body of mushrooms, in agaricales, common fungi common fairy-ring mushroom, shiitake, enoki, oyster mushrooms, fly agarics , other amanitas, magic mushrooms species...