Cladosporium sphaerospermum

A slow-growing fungus that produces a olive green or olivaceous brown velvety colony with an greenish-black reverse, when incubated at 25oC (77oF) in ten days. The hyphae, conidiophores, and conidia are pigmented olivaceous-brown (dematiaceous). It is found worldwide and is a very common fungus isolated from the dead organic matter, air, soil, plants, desert soil, caves, fresh water, foodstuffs, bird feathers, and rarely from humans and animals. Very rarely, it can be an opportunistic human pathogen but it can cause an immediate-type hypersensitivity – type I (IgE-mediated) extrinsic asthma.

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