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Acremonium
Wed, 08/19/2009 - 10:52 — aemtek
Genus:
Acremonium
Distribution:
About 100 species reported worldwide, ubiquitous in nature.
Substrate:
Most of the species of this fungus are saprophytic. Substrates include soil, rotting organic materials, dung, dead beetles, and other fungi.
Dispersal:
Many species form conidia in slimy heads, such are dispersed by insect activity or water splash. Dried conidia or species with conidia formed in dry chains are dispersed by wind.
Indoor Occurance:
Commonly found indoors on wet building materials. Acremonium strictum is found in carpet and house dust, damp or wet walls, gypsum board, wallpaper, humidifier water, and wood.
Allergenicity:
Associated with allergic reactions, such as allergic rhinitis (hay fever), asthma, and hypersensitivity pneumonitis.
Pathogenicity:
Opportunistic pathogens causing gummatous ulcers (mycetoma) and onychomycosis. Rarely causes keratitis, endophthalmitis, endocarditis, and meningitis in immunocompromised people.
Notes On Identification:
Spores are not distinctive on spore trap samples. The fungus can be identified in culture or from surface samples if sporulating structures are present.
References:
Domsch et al. , 1980
Teleomorph:
Emericellopsis coarachis v. Beyma, Mycoarachis Malloch & Cain, Nectria (Fr.)Fr.
Spore Types:
Conidia hyaline or colored, mostly ovoid, unicellular or rarely bicellular, in slimy heads or in dry chains at the apices of the phialides. Common species: A. kiliense and A. murorum.
Notes On Species:
Acremonium kiliense - causes gummatous ulcers (mycetoma), especially in warmer climates. A. murorum - widely distributed with wide range of substrates. A. strictum - the most frequent Acremonium species inhibiting the soil. It also grows on fuel and fuel
Spore TrapIdentification:
Not distintive on spore trap samples.