Abstract: A strain of Aspergillus isolated from a patient with leukemia was confirmed as Aspergillus Tetrazonus histopathologically and mycologically.Biopsy showed thick,short,globose and distorted hyphae in pulmonary tissue.Colonies on Czapek's agar grew well at 37℃.The surface was purplish with floccosity in some area.Conidial heads were short,columnar,light green,60～70×30～ 40μm in size.Stipes were smooth-walled,dull brownish in color.Vesicles were hemispherical 7～9μm in diameter.Conidia were globose,pale yellowish green and rugose.Cleistothecia enveloped by thick walled hull ceils were spherical,and 120～150μm in diameter.Ascospores were purplish red,smoothwalled with two pleated equatorial crests paralleled by a secondary narrower pair of crests which were sometimes indistinct.As a pathogenic species,this is a first report in China.

Key words: Aspergillus Tetrazonus, Aspergillosis,Pulmonary