Aspergillus niger Tiegh.

IMI 50566

Macroscopic characters

Colony diameter on CYA after seven days incubation at 25°C 45-70 mm; conidia black; exudate and soluble pigment absent; reverse pale yellow. Colonies on MEA 54-64 mm in diameter; conidia black; exudate and soluble pigment absent; reverse uncolored. Colonies on CY20S 60-70 mm in diameter; conidia black; exudate and soluble pigment absent; reverse uncolored to pale yellow. Colonies on CZ 40-50 mm in diameter; conidia black; exudate and soluble pigment absent; reverse uncolored to pale yellow. Colonies on CYA at 37°C 35-70 mm in diameter.

Microscopic characters

Stipes 900-1600 um long, smooth-walled, hyaline to pale brown in color. Vesicles 40-60 um in diameter, globose, pale yellow to pale brown. Aspergilli biseriate. Conidia 3.5-4.5 um in diameter, globose to subglobose in shape, surface texture rough to very rough.

Note

A. niger belongs to a species complex. Molecular data indicate that at least one other species is present, but taxonomic work to resolve the problems in this complex is still underway.

Plate 5. Aspergillus niger Tiegh. IMI 50566

A. Colony on CYA, 7 days at 25°C.
B. Macrograph of the conidial heads showing the columnar heads.
C-D. Conidiophores: C. 200x- D. 900x.
E. Conidia 1400x.

Aspergillus Reference Cultures