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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 www.doctorfungus.org @ 2005)

 

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

 

Ecology

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

Species

 

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:

http://www.osha.gov
http://www.doctorfungus.org
http://www.mycology.adelaide.edu.au
http://www.mycology.adelaide.edu.au

http://www.dehs.umn.edu
http://www.mold-help.org
http://www.mycology.net
http://www.clinical-mycology.com
http://www.botany.utoronto.ca
http://www.med.sc.edu
http://www.tigr.org
http://www.pangloss.ucsfmedicalcenter.org
http://www.dermnz.org
http://ncbi.nlm.nih.gov
http://www.wadsworth.org
http://botit.botany.wisc.edu

 

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

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