Place of origin: It is mainly grown in Qingchuan county, Xichang county andJinchuan county of Sichuan province.
Growing time: From Mar. to Jul. every year.
Total quantity of a year: 300MT
Specification (Its cap length):
1. Grade S: ￡?1cm
2. Grade M: 1 ? 3cm
3. Grade L: 3 ? 5cm
4. Grade LL: ￡?5cm
Note: Their foot with sand has been removed