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Mould Identification: A Virtual Self Assessment

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Unknown 67 = Rhinocladiella atrovirens

Case History
A cattle worker from tropical Queensland presented with chronic verrucous cutaneous lesions the hand. The culture described below was isolated.
Clinical Presentation

Chronic verrucous chromoblastomycosis of the hand. Note tissue hyperplasia forming a white verrucoid cutaneous lesion. In Australia, chromoblastomycosis occurs mostly on the hands and arms of timber and cattle workers in humid tropical forests.
Culture

Cultures of Rhinocladiella atrovirens are restricted, velvety or lanose, olivaceous, often slightly mucoid at the centre; reverse dark olivaceous green to blackish.
Microscopy

Budding cells, if present, are hyaline, thin-walled, broadly ellipsoidal, 3.0-4.3 x 1.7-2.5 µm. Germinating cells are inflated, spherical to subspherical, 4.5-6.0 µm.

            

Conidiophores are short, brown, thick-walled. Conidiogenous cells are cylindrical, intercalary or free, 9-19 x 1.6-2.2 µm; denticulate rachis up to 15 µm long, with crowded, flat or butt-shaped, unpigmented conidial denticles. Conidia are hyaline, thin- and smooth-walled, short-cylindrical, with truncate basal scars, 3.7-5.5 x 1.2-1.8 µm. RG-1 organism.
Comment: Rhinocladiella contains 6-8 species, with five species of medical interest; notably R. atrovirens and R. aquaspersa.

About Rhinocladiella Back to Virtual Assessment

What is your identification?

Phaeroacremonium parasiticum
Rhinocladiella atrovirens
Myrecridium schulzeri

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Dr David Ellis
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