Curvularia geniculata

Curvularia geniculata

Curvularia geniculata spores

Curvularia geniculata is a species of fungus belonging to the genus Curvularia. It is a saprophytic fungus commonly found in soil and on plant debris. This species is known for its distinctive curved conidia, which are a key feature in its identification.

Morphology

Curvularia geniculata produces dark, septate hyphae and conidia that are typically curved, giving the genus its name. The conidia are multicellular, with three to five cells, and are borne on geniculate (knee-shaped) conidiophores. The central cell of the conidium is often darker and larger than the others, which is a characteristic feature of this species.

Habitat and Distribution

This fungus is widely distributed in tropical and subtropical regions. It is commonly isolated from soil, decaying plant material, and air samples. Curvularia geniculata can also be found on a variety of substrates, including grains, seeds, and other organic matter.

Pathogenicity

While primarily a saprophyte, Curvularia geniculata can occasionally act as an opportunistic pathogen in humans and animals. It has been associated with infections such as keratitis, sinusitis, and onychomycosis. In plants, it can cause leaf spots and other minor diseases, although it is not considered a major plant pathogen.

Medical Significance

In humans, infections caused by Curvularia geniculata are rare but can occur in immunocompromised individuals. The fungus can cause mycotic keratitis, an infection of the cornea, which may require antifungal treatment. Diagnosis is typically made by microscopic examination and culture of clinical specimens.

Laboratory Identification

In the laboratory, Curvularia geniculata can be identified by its growth on standard fungal media. The colonies are fast-growing, with a woolly to cottony texture, and are initially white, turning to dark olive or brown with age. Microscopic examination reveals the characteristic curved conidia and geniculate conidiophores.

Related Pages

• Curvularia
• Fungal infection
• Keratitis
• Opportunistic infection