Technically, cordyceps sinensis is actually not a mushroom. Cordyceps Sinensis is an Ascomycetes fungus closely related to mushrooms. We will leave it to botanist to explain the exact difference among fungi, but poor cordyceps sinensis just doesn't quite make it as a mushroom. The problem is to most people, if it looks like a mushroom, smells like a mushroom, acts like a mushroom... it is a mushroom. So, throughout history Cordyceps Sinensis has been called a mushroom, and who are we to rewrite history. Please then excuse our literary license, but we too will go along and refer to cordyceps sinensis as a mushroom. But if you are ever on Jeopardy and the answer is "Technically not a mushroom" - you know the question