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DESCRIPTIONS OF MEDICAL FUNGI

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Descriptions of Medical Fungi 9<br />

Arthroderma insingulare Padhye and Carmichael<br />

Synonymy: Trichophyton terrestre Durie and Frey.<br />

Arthroderma insingulare is a geophilic fungus of worldwide distribution which may<br />

occur as a saprophytic contaminant on humans and animals. Durie and Frey (1957)<br />

first described this soil fungus as Trichophyton terrestre from New South Wales,<br />

Australia. Since then T. terrestre has been described as an anamorph of three different<br />

species of Arthroderma; A. insingulare, A. lenticulare and A. quadrifidum (Padhye<br />

and Carmichael, 1972). However, ITS and D1/D2 sequencing of the original isolates<br />

obtained from the Mycology Laboratory at Royal North Shore Hospital, Sydney has<br />

now identified this fungus as Arthroderma insingulare. RG-1 organism.<br />

Morphological Description: Colonies are usually flat to downy with a suede-like to<br />

granular texture resembling T. mentagrophytes. The surface colour may range from<br />

white to cream, buff to yellow, or greenish-yellow. Reverse pigmentation is usually<br />

yellowish-brown although some variants have a deep rose red reverse. Microconidia<br />

are large, clavate or pedicellate, usually exhibiting transition forms to more or less<br />

abundant lateral macroconidia. Macroconidia are clavate to cylindrical with rounded<br />

ends, smooth and thin-walled, and are two to six-celled. Chlamydospores, hyphal<br />

spirals, racquet mycelium and antler hyphae may also be present. No growth at 37 O C.<br />

Molecular Identification: ITS and D1/D2 sequencing is recommended for definitive<br />

identification of isolates.<br />

a<br />

b<br />

20 µm<br />

Arthroderma insingulare (a) culture and (b) macroconidia.

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