There are materials to prove that this kind of thing first appeared in the book is "yuhengzhi of Guihai" written in 1162 A.D., and the author is fan da. It said that "it can be steamed, not eaten, epileptic, or see ghosts" which is called "mad fruit".
The shell of mad fruit is smooth with longan, but there is no scaly shell like longan. Moreover, the flesh is also sticky, not easy to peel, and has no special toughness of longan flesh, and the meat taste is sweet and memorable. But then again, are lunatics really poisonous? In fact, it is toxic, and the most toxic is nucleolus.
By the way, I'll tell you how to distinguish these two kinds of fruits. The outer part of longan is relatively smooth, a few of them are not obvious scale spots, and there is a small "bud" beside the fruit base, with lines around. "Mad fruit" is generally ground, there is no longan smooth, if you wipe with your hands, you will find that there is a small powder yellow.
