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Aspergillus versicolor The U.S. Government's Occupational Safety and Health Administration [OSHA] lists Aspergillus versicolor as an allergen and an irritant and a cause of Hypersensitivity Pneumonitis and Dermatitis.
Aspergillus versicolor is a causative agent of Aspergillosis. (Information from www.doctorfungus.org @ 2005)
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Aspergillus versicolor Mold Picture
(Image Courtesy of www.doctorfungus.org @ 2005)
Take note of the smooth conidiophore, small vesicle, metulae, and phialides bearing roughened globose conidia of Aspergillus versicolor. Reduced Penicillium - like fruiting structures are frequently present.
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Ecology Aspergillus versicolor is a cosmopolitan fungus which is particularly common in temperate and colder areas. It is often found in buildings with problems on humidity and ventilation. Aspergillus versicolor is primarily isolated from plant materials and from soil. Pathogenicity and Health Effects Aspergillus versicolor rarely causes deep infections in humans. It is an occasional agent of onychomycosis. Macroscopic Appearance Ø Growth rate is moderately rapid and texture of colonies is downy to powdery; and Ø Surface colony color may range from white, yellow, beige, to yellow – green or emerald green, at times with a clear to wine – red exudate while the reverse is uncolored, yellowish to reddish.
Microscopic Appearance Ø Hyphae are septate and hyaline and conidial heads are loosely radiate to columnar and biseriate; Ø Vesicles are variably shaped, are small which measure 9 – 16 µm in diameter, and with metulae and phialides covering almost the entire vesicle; Ø Conidiophores are smooth – walled and brittle, hyaline to pale brown, and with length ranging from 120 – 700 µm long; Ø Reduced conidial structures resembling those of Penicillium species are commonly observed; and Ø Conidia are globose, appear in chains, more or less rough - walled, and with size of 2.5 – 3 µm in diameter; and Ø Hülle cells, when present, are globose. |
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