(Vuillemin) Tiraboschi, 1926

Macroscopic morphology

Colonies on potato dextrose agar at 25°C are variously colored (versicolored) and may range from very pale green, to greenish-beige, pinkish-green, salmon green, or dark green. Reverse is reddish to uncolored. Exudate, when present, is pink to reddish-brown. The growth rate is slow to moderate.

Microscopic morphology

Hyphae are septate and hyaline. Conidial heads are biseriate and loosely radiate. Conidiophores measure 120-700 µm in length, are hyaline to pale brown, smooth-walled and brittle (can see where many have “snapped off”). Vesicles are small (approximately 9-16 µm in diameter) and variably shaped, with metulae and phialides covering most of the vesicle. Reduced conidial structures resembling those seen in Penicillium species are common. Conidia measure 2.5-3 µm in diameter, are globose, and may be fine to distinctly roughened. Globose Hülle cells may also be present. Restricted growth at 35°C [531, 1215, 1875, 2202].

Special notes

Aspergillus versicolor has been reported as an agent of cutaneous disease, [800], onychomycosis[2247], otomycosis [521, 1972], osteomyelitis[1359], pulmonary disease[1051], and a mycetoma-like granuloma in a horse[1177]. Its mycotoxin, sterigmatocystin, has been studied in foodstuffs[1738, 1892] and in damp indoor environments[669].

FTL* in vitro susceptibility data

0.5 µg/ml=1 0.03 µg/ml=1 0.125 µg/ml=1 0.25 µg/ml=2 0.03 µg/ml=1 16 µg/ml=1
1.0 µg/ml=1 0.06 µg/ml=2 0.25 µg/ml=1 0.5 µg/ml=3 >64 µg/ml=9
2.0 µg/ml=5 0.25 µg/ml=1 0.5 µg/ml=3 1.0 µg/ml=2
4.0 µg/ml=1 4.0 µg/ml=1 1.0 µg/ml=2 2.0 µg/ml=2
8.0 µg/ml=1 32 µg/ml=1 4.0 µg/ml=1
>64 µg/ml=1


Drug/N AMB/9 CAS/7 ITRA/8 VORI/9
MIC Range 0.5-8.0 0.03>64 0.125-1.0 0.25-2.0
MIC50 2.0 0.25 0.5 0.5

* Fungus Testing Laboratory unpublished data (NCCLS M38-A)