Date: 7 May 2013
Copyright: n/a
Notes:
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.
Images library
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Title
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Pt FT. Autopsy appearance of the trachea, after the adherent pseudomembrane had been removed, revealing confluent ulceration superiorly with small green plaques of Aspergillus growth on the trachea inferiorly.
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This view was obtained in a lung transplant recipient at bronchoscopy. Aspergillus fumigatus was grown from bronchial lavage but invasion was not demonstrated on bronchial biopsy. Symptoms improved with itraconazole therapy and abnormal appearances had resolved within 2 weeks.
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Bronchoscopic view of Aspergillus tracheobronchitis. Bronchial lavage revealed hyphae in microscopy and cultures grew A.fumigatus. This man had received a lung transplant a few weeks before. Invasion of mucosa, but not cartilage, was demonstrated histologically. He responded rapidly to oral itraconazole.
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This view from indirect laryngoscopy illustrates bilateral lesions on the larynx that on biopsy were shown to be due to Aspergillus. This is a rare disease in non-immunocompromised patients.
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Bronchoscopic view of a deep bronchial ulcer in a lung transplant patient. Biopsies through the ulcer yielded cartilage with hyphae invading it. Fungal cultures of bronchial lavage grew Aspergillus fumigatus. He responded to oral itraconazole therapy.
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Patient had life threatening pneumonia, cavity formation was later observed. He later presented with a fungal ball. The aspergilloma was removed by surgical resection of the right upper lobe.
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