Like the Mexicana strain, this Truffle can also be found and cultivated as a Psilocybine Mushroom, which has been used for ceremonial rituals by South American Shamans for centuries.
For most people, 5 to 9 grams have a medium effect, while 10 to 15 grams can lead to a strong high. 
First effects are likely to be felt after around 10 minutes and can last up to 6 hours. 
You can eat Truffles or use them as a tea (let it simmer for 20 minutes, don't let the water boil).

BE AWARE that these amounts are averages and can vary from person to person. Always start with a low dose.