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 Add this item to the list  821684 Original description
   
Remarks (public):Aspergillus contaminans belongs to Aspergillus sect. Usti and is morphologically similar to A. carlsbadensis. It can be distinguished by slow growth at 30 °C (MEA and CYA, 7 days: 2–4 and 4–5 mm, respectively) in contrast to A. carlsbadensis (28–32 and 19–24 mm, respectively). 
Description type:Original description 
Description:On MEA: Stipes light brown with age becoming brown, smooth, occasionally finely roughened, (100–)250–600(–800) × 4–7(–8) μm; conidial heads radiate to columnar, pale brown to brown; biseriate; vesicle nearly globose or pyriform, (12–)15–24(–28) μm diam; metulae cylindrical, covering half to two thirds (rarely entire) of the vesicle, (3–)4–7(–8) × (2.5–)3–4(–5) μm; phialides ampulliform, (6–)7–9 × (2–)2.5–3(–3.5) μm; conidia globose to subglobose, occasionally ellipsoidal, rough-walled to spinose, green-brown in mass, 3–4(–4.5) μm diam including ornamentation (3.7 ± 0.2), spore body 2.3–3.5 μm diam (2.9 ± 0.2); Hülle cells irregularly ovoid or elongated, frequently curved, 15–40(–52) × 8–18(–20) μm, L/W 1.1‒3.8 (2.2 ± 0.7). Culture characteristics — (in the dark, 25 °C after 7 days): Colonies on MEA 32–33 mm diam, sporulating area pale brown to olive-brown, good sporulation, mycelium white to pale yellow, floccose, centrally abundant aggregations of pale yellow Hülle cells, lightly overgrown with hyphae, exudate clear, no soluble pigment, reverse buff. Colonies on CYA 35–36 mm diam, sporulating area grayish-brown, poor sporulation, inconspicuous, covered with white to very pale yellow mycelium, lightly floccose to nearly velutinous, radially and concentrically moderate deep sulcate, pale yellow Hülle cell aggregations at the center of colony, exudate clear to pale yellow only at the center of colony, no soluble pigment, reverse buff yellow. Colonies on OA 31–32 mm diam, light brown to brown, sporulation moderately good, mycelium white to pale, floccose, abundant aggregations of pale yellow Hülle cells covered with hyphae, exudate clear to pale brown, no soluble pigment, reverse light-brown. Colonies on PDA 30–31 mm diam, sporulation area pale buff to pale brown, very good sporulation at the center of colony, mycelium white to pale yellow, floccose, occasionally radially lightly sulcate, Hülle cells abundant, covered with mat of hyphae, exudate clear to pale brown, no soluble pigment, reverse buff to pale yellow. Colonies on CY20S 30–31 mm diam, sporulating area brown, poor to good sporulation, mycelium white, floccose , no exudate, no soluble pigments, reverse pale to pale buff. Colonies on CREA growing more slowly compared with other media, 19–20 mm diam, poor sporulation, mycelium white, Hülle cells, sparse, no production of acid compounds. No growth on MEA and CYA at 37 °C. 
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