1 INTRODUCTION Bailong River, a tributary of Jialing River belonging to the Yangtse River system, is located in the southern part of Gansu Province and the northeast rimland of Qinghai-Tibet Plateau, with total length of over 600km and drainage area of about 31,800km^2. Originating from Dagcanglhamo,
鸡皮衣科Pertusariaceae隶属于鸡皮衣目Pertusariales。该科的主要特征是地衣体壳状，常缺乏下皮层；子囊器茶渍型，侧丝分枝结网状；子囊壁一般较厚，多为两层，顶部内壁层加厚，常淀粉质；子囊1-8个孢子，孢子大型，无色透明；光合共生物为球形绿藻。Kirk et a1．（2001）记录Pertusariaceae有4个属，即Ochrolechia、Pertusaria、Thamnochrolechia和Varicellaria。
Thirteen species of the lichen genus Ramalina are reported from Northeastern China. Descriptions, comments and illustrations of two species new to China, R. conduplicans and R. yasudea are provided. The earlier reports of R. fraxinea and R. polymorpha are found to be misidentified, and the correct names of them are R. sinensis and R. sekika respectively.
