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Aspergillus fumigatus Fresen Link to species page

A fumigatus conidial head
A fumigatus growing on laboratory medium
Aspergillus fumigatus
A fumigatus conidia
microscopy A.fumigatus
A fumigatus conidial head, colour image
A fumigatus conidial head, colour image
Aspergillus fumigatus conidia
Aspergillus fumigatus conidia
EM of A.fumigatus conidial head

The images below were kindly supplied by Walter Blyth, Department of Botany, Edinburgh University
Aspergillus fumigatus in lung
Lung necrosis
us fumigatus in lung
Lung necrosis
us fumigatus in lung
Necrotic tissue in culture

us fumigatus in alveoli
Sections of colonised alveoli

us fumigatus
Microscopic conidiae

us fumigatus in mucus
Mucus plug
us fumigatus in sputum
Sputum sample
us fumigatus in lung cavity
Cavity in lung
us fumigatus -  aspergilloma
us fumigatus growth inhibition
Inhibition of growth by bacteria

Colonies on CYA 40-60 mm diam, plane or lightly wrinkled, low, dense and velutinous or with a sparse, floccose overgrowth; mycelium inconspicuous, white; conidial heads borne in a continuous, densely packed layer, Greyish Turquoise to Dark Turquoise (24-25E-F5); clear exudate sometimes produced in small amounts; reverse pale or greenish. Colonies on MEA 40-60 mm diam, similar to those on CYA but less dense and with conidia in duller colours (24-25E-F3); reverse uncoloured or greyish. Colonies on G25N less than 10 mm diam, sometimes only germination, of white mycelium. No growth at 5°C. At 37°C, colonies covering the available area, i.e. a whole Petri dish in 2 days from a single point inoculum, of similar appearance to those on CYA at 25°C, but with conidial columns longer and conidia darker, greenish grey to pure grey.

Conidiophores borne from surface hyphae, stipes 200-400 µm long, sometimes sinuous, with colourless, thin, smooth walls, enlarging gradually into pyriform vesicles; vesicles 20-30 µm diam, fertile over half or more of the enlarged area, bearing phialides only, the lateral ones characteristically bent so that the tips are approximately parallel to the stipe axis; phialides crowded, 6-8 µm long; conidia spherical to subspheroidal, 2.5-3.0 µm diam, with finely roughened or spinose walls, forming radiate heads at first, then well defined columns of conidia.

Distinctive features

This distinctive species can be recognised in the unopened Petri dish by its broad, velutinous, bluish colonies bearing characteristic, well defined columns of conidia. Growth at 37°C is exceptionally rapid. Conidial heads are also diagnostic: pyriform vesicles bear crowded phialides which bend to be roughly parallel to the stipe axis. Care should be exercised in handling cultures of this species.

Produced by J. Pitt, April 1998

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