马蹄金褐色叶斑病的症状及核腔菌属一新种

Symptoms of dichondra brown leaf spot and a new species of Pyrenophora

褐色叶斑病是草坪草旋花科马蹄金属马蹄金上一新的重要病害。2005年,该病在四川雅安的病叶率90%,造成马蹄金草坪早衰和枯死。描述了马蹄金褐色叶斑病的马蹄金核腔菌新种（Pyrenophora dichondrae sp.nov.）：假囊壳（278-374）μm×（105-144）μm,子囊（152-189）μm×（43-54）μm,子囊孢子横隔膜4-5个,纵隔膜2-3个,（36-52）μm×（10-23）μm。模式标本保存于四川农业大学植物保护系（MLSAU）。

Dichondra brown leaf spot is a new disease in the China. The percentage of the diseased leaves reached 90% in 2005 in Yaan city, Sichuan province , China, which caused decline and death of the grass. The symptom of the disease was described. Pyrenophora dichondrae sp. nov. was described based on morphologied character of asci and ascospores from the dichondra brown leaf spot. The new a species was characterized by pseudothecia, asci and ascospores with sizes （278 -374） μm× （105 -144）μm, （152 -189） μm× （43 -54） μm and （36 -52） μm× （10 -23） μm and numbers of diaphragm 4 -5 of horizontal diaphragm and 2 -3 of vertical diaphragm. The type specimens is preserved in Department of Plant Protection, Sichuan Agricultural University （MLSAU）.