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Mould Identification: A Virtual Self Assessment

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Unknown 4 = Biploris australiensis

Case History
A 40 year old man presented with a history of nasal polyps and chronic sinustis and headaches.  Imaging showed pansinusitis and opacification of the paranasal sinuses. A sinus tissue biopsy grew the fungus shown below.
Culture

Cultures of B. australiensis on Sabouraud's dextrose agar are rapid growing, flat, spreading, suede-like to downy and are grey to blacklish-brown.
Microscopy

Microscopic morphology of B. australiensis showing sympodial development of darkly pigmented, multicellular conidia (phragmoconidia) on a geniculate or zig-zag rachis.  Conidia are fusiform to ellipsoidal, germinating only from the ends (bipolar). The genera Bipolaris, Curvularia and Exserohilum are all closely related.
Comment: The genus Bipolaris contains about 45 species which are mostly subtropical and tropical plant parasites; however several species, notably B. australiensis, B. hawaiiensis and B. spicifera are well documented human pathogens. Recent molecular studies have recognised Bipolaris cynodontis, B. micropus, and B. setariae as additional species isolated from clinical samples.

About Bipolaris Back to Virtual Assessment

What is your identification?

Exserohilum rostratum
Curvularia brachyspora
Bipolaris australiensis

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School of Biological Sciences
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THE UNIVERSITY OF ADELAIDE
SA 5005 AUSTRALIA

Contact

Dr David Ellis
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