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.
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
species is an occasional agent of nail or skin infections. Some cases of
subcutaneous or disseminated infection have also been noted. Additionally,
and Scytalidium hyalinum are causative agents of
Growth rate is very rapid and colony texture is wooly; and
surface and reverse colony color ranges from white to gray.
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
Brown – colored arthroconidia
Scytalidium dimidiatum and Scytalidium hyalinum are usually inhibited by
unlike Geotrichum, produces wooly colonies and brown – pigmented
hyphae and arthroconidia.