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Scytalidium Mold Species

Scytalidium species are causative agents of Dermatomycosis,
Dermatophytosis, and  Phaeohyphomycosis.

(Information from www.doctorfungus.org @ 2005)

 

 

 

Taxonomic Classifications

Kingdom: Fungi
Phylum: Fungi Imperfecti
Genus: Scytalidium

Scytalidium Mold Picture

Scytalidium microscopic morphology

(Image Courtesy of www.doctorfungus.org @ 2005)

Microscopic morphology of the Scytalidium anamorph showing chains of 1 - to 2 - celled, darkly pigmented arthroconidia produced by the holothallic fragmentation of undifferentiated hyphae.

 

 

Ecology

Scytalidium is a cosmopolitan, saprobic fungus which is at times associated with decaying wood or soil, and sometimes with woody plants diseases, particularly in tropical and sub tropical regions. 

 

 

Species

 

This genus lacks a known sexual state and is generally classified as a dark walled dematiaceous fungus.  There are five existing species under the Scytalidium genus namely, Scytalidium dimidiatum, Scytalidium hyalinum, Scytalidium infestans, Scytalidium japonicum, and Scytalidium lignicola

 

 

 

Pathogenicity and Health Effects

 

Scytalidium species is an occasional agent of nail or skin infections.  Some cases of subcutaneous or disseminated infection have also been noted.  Additionally, Scytalidium dimidiatum and Scytalidium hyalinum are causative agents of onychomycosis and dermatomycosis.

 

 

Macroscopic Appearance

 

     Growth rate is very rapid and colony texture is wooly; and

      Both surface and reverse colony color ranges from white to gray.

 

 

Microscopic Appearance

 

      Hyphae are septate, hyaline or pale gray in color; and

      Arthroconidia are hyaline or pale brown in color, ellipsoidal - or oval shaped, and unicellular or bicellular.

 

 

               Table 1. Microscopic Feature Differences in Scytalidium arthroconidia.

Scytalidium species

Microscopic Features

Scytalidium dimidiatum

Brown colored arthroconidia

Scytalidium hyalinum

Hyaline arthroconidia

 

 

 

Susceptibility

 

Scytalidium dimidiatum and Scytalidium hyalinum are usually inhibited by cycloheximide. 

 

 

Remarks

 

Scytalidium, unlike Geotrichum, produces wooly colonies and brown pigmented hyphae and arthroconidia.
 

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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