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Mould Identification: A Virtual Self Assessment

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Unknown 35 = Cylindrocarpon lichenicola

Case History
A 53 year old farmer, presented with complaints of pain, redness and irritation of the left eye following ocular injury caused by hay 5 days earlier. Slit-lamp examination of the affected eye revealed a corneal ulcer with irregular margins. Scrapings were taken from the base and edges of the corneal ulcer by a sterile blade. Microscopic examination of these scrapings revealed the presence of septate fungal hyphae and the culture below was grown.
Culture

Colonies are fast growing, hyaline or bright-coloured, suede-like or woolly. Sporodochia may occasionally be present.
Microscopy

Conidiophores consist of simple or repeatedly verticillate phialides, arranged in brush-like structures. Phialides are cylindrical to subulate, with small collarettes producing hyaline, smooth-walled conidia, which are arranged in slimy masses. Two types of conidia may be produced; macroconidia which are one to several septate, hyaline, straight or curved, cylindrical to fusiform, with a rounded apex and flat base; and microconidia which are one-celled, which are usually clearly distinct from the macroconidia.

Chlamydospores may be present or absent, hyaline to brown, spherical, formed singly, in chains or in clumps, intercalary or terminal.
Comment: The genus contains 35 species, is widespread, isolated mostly from soil and is recorded as an occasional human and animal pathogen. Cylindrocarpon differs from Fusarium by lacking an asymmetrical foot-cell on the macroconidia.  RG-2 organism if isolated from humans.

About Cylindrocarpon Back to Virtual Assessment

What is your identification?

Cylindrocarpon lichenicola

Fusarium solani
Fusarium oxysporum

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Dr David Ellis
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