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Mould Identification: A Virtual Self Assessment

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Unknown 43 = Schizophyllum commune

Case History
A 59-year-old man with a gastric carcinoma developed a bronchopneumonia, which was diagnosed through the use of X-ray and showed an abnormal infiltrative shadow. Samples of bronchial aspirate were collected and showed the presence of septate hyaline hyphae and culture below was grown.
Culture
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Colonies on 2% malt extract agar are spreading, woolly, whitish to pale greyish-brown, soon forming macroscopically visible fruiting bodies. Although some isolates may take up to 12 weeks to form fruiting bodies. Fruit bodies are sessile, kidney-shaped, lobed with split gills on the lower side. Hyphae are hyaline, wide and have clamp connections (although many primary clinical isolates are monokaryotic and will therefore not produce clamp connections). Basidia bear 4 basidiospores on erect sterigmata. Basidiospores hyaline, smooth-walled, elongate with lateral scar at lower end, 6-7 x 2-3 µm.

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Basidiocarps of Schizophyllum commune on malt extract agar.

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Basidiocarps of Schizophyllum commune on malt extract agar.
Note: many clinical isolates of S. commune are monokaryotic and therefore do not show clamp connections, therefore any white, rapidly growing, sterile isolate showing good growth at 37C with tolerance to benomyl, susceptibility to cycloheximide, and a pronounced odour should be suspected of being S. commune.

Comment: Shizophyllum is a common bracket fungus on rotten wood, and is an occasional human pathogen, principally associated with sinusitis, allergic bronchopulmonary mycosis and as a contaminant from respiratory specimens. RG-1 organism.

About Schizophyllum Back to Virtual Assessment

What is your identification?

Schizophyllum commune

Bjerkandera adusta
Sporotrichum pruninosum

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Dr David Ellis
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