甘肃白龙汀流域肉疣衣科地衣研究

1 INTRODUCTION Bailong River valley is situated in the south of Gansu Province and northeast of Qinghai-Tibet Plateau at longitudes of 101°40'-105°20' E and latitudes of 32°21'-35°50' N.The mean annual precipitation is 448.9-911.6ram and the mean annual temperature 4.7℃-12.7℃.The drainage area has an elevation from 550m to 4920m.The complex habitats give rise to a variety of forest communities and varied patterns of ecosystems.

The lichen family Ochrolechiaceae from Bailong River Valley in Gansu Province,China