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Mould Identification: A Virtual Self Assessment

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Unknown 65 = Arthrographis kalrae

Case History
A 14-year-old boy presented with with scaly lesions on the soles of his feet.  Direct microscopy of skin scrapings was negative but the culture grew the fungus shown below.
Culture

Colonies with slow to moderate growth, creamy white to tan-coloured. Initially, yeast-like then developing hyphal growth and conidiophores subhyaline, narrow, branched, often in bundles, occasionally forming whitish, large 0.5 cm, linear synnemata.
Microscopy

Arthroconidia are one-celled, hyaline, smooth-walled, oblong to cylindrical, with truncate ends, 2.5-9 x 1-2 µm. Spherical blastoconidia 2-4 x 2-3 µm, may also be formed laterally and sessile on undifferentiated hyphae.
Comment: Arthrographis is an arthroconidial mould comprising four species: A. kalrae, A. lignicola, A. pinicola and A. alba. These fungi are commonly found in environmental samples (soil, wood, air and water), but are isolated rarely from clinical specimens.

About Arthrographis Back to Virtual Assessment

What is your identification?

Magnusiomyces capitatus
Saprochaete clavata
Arthrographis kalrae

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School of Biological Sciences
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THE UNIVERSITY OF ADELAIDE
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Dr David Ellis
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