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Drechslera Mold Species

Drechslera biseptata is recently isolated from a brain abscess in a patient.

(Information from  A Clinical Laboratory Handbook: Identifying Filamentous Fungi)



Taxonomic Classifications

Kingdom: Fungi
Phylum: Fungi Imperfecti
Genus: Bipolaris and Exserohilum at Present


Drechslera Mold Pictures


(Image Courtesy of University of Adelaide, Mycology Online)


Conidia of Drechslera species



Picture of Drechslera microscopic photo from doctor fungus

(Image Courtesy of @ 2005)


Take note of the microscopic morphology of Drechslera species showing conidia without distinct hila.



Drechslera is a cosmopolitan fungus, dematiaceous fungus primarily isolated from plants and soil.  Some species are considered as plant pathogens. 



This genus lacks a known sexual state and is generally classified as a dark walled dematiaceous fungus.  McGinnis et. al. (1986) have reviewed the Drechslera isolates from human and animal disease and concluded that all pathogenic species are today considered as members of the genera Bipolaris and Exserohilum.


Pathogenicity and Health Effects


Drechslera biseptata is isolated from a brain abscess recently in a patient evidently lacking any predisposing condition.  Drechslera biseptata is the sole species known to cause human or animal disease. 


Macroscopic Appearance


     Growth is rapid colony texture is velvety to wooly;

      Both surface and reverse colony color is initially white becoming olive brown to black.


Microscopic Appearance


      Hyphae are septate and brown in color;

      Conidia are pale to dark brown in color, cylindrical or sub cylindrical in shape, straight and smooth walled, without a protuberant hilum, and arise through a pore in a sympodially elongating geniculate conidiophore;

      Conidiophores are brown in color, simple or branched and geniculate; and

      Germ tubes are observed developing perpendicularly to the long axis of the conidium.


Laboratory Precautions


Only general laboratory precautions are required, no special safety measures needed.

The mycological information gathered and organized in this extensive research on different Pathogenic Molds was sourced out from the list of informative websites and reference below:


 A Clinical Laboratory Handbook: Identifying Filamentous Fungi by St. Germain, Guy and R. Summerbell.

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