NEW SPECIES OF POWDERy MILDEWS FROM WUYISHAN
武夷山白粉菌新种

Three new powdery mildews collected from Wuyishan,Fujian prov.are described.These new taxa are:Erysiphe malloti sp.nov.on Mallotus lianus Croiz., Erysiphe weigelae sp.nov.Weigela (?)aponica Thunb.var.sinica(Rehd.)Bailey and Uncinula hydrang(?) sp.nov.on Hydrangae paniculata Sieb.Of which,Unicinula geae sp.nov.is the first record of an Uncinula parasitic on a species of the family Hydran- geaceae.Latin and Chinese diagnoses for the new taxa are given. Holotypes of the above new taxa are deposited in Fujian Agricultural College,Fujian Prov.,and isotypes of which are deposited in the Mycological Herbarium of the Institute of Microbiology,Academia Sinica,Beijing.