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Unknown 4 = Curvularia australiensis (formerly Bipolaris australiensis)
Culture: Cultures of C. 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 C. 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 Curvularia contains about 80 species, which are mostly soil or plant pathogens. Recently, clinical isolates previously identified as Bipolaris species, notably B. australiensis, B. hawaiiensis and B. spicifera have now been transferred to Curvularia.
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