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Aspergillus

Recognized by its distinct conidiophores terminated by a swollen vesicle bearing flask-shaped phialides. The phialides may be borne directly on the vesicle (a) or on intervening metulae (b). Some species may form masses of thick-walled cells called "hülle cells" (c). The spores come in several colours, depending upon the species, and are produced in long chains from the ends of the phialides. Commonly isolated from soil, plant debris, and house dust; sometimes pathogenic to man. Holomorphs: Emericella, Eurotium, Neosartorya, and others. Refs: Klich, 2002; Klich and Pitt, 1988; Raper and Fennell 1965; Samson 1979; Samson and Varga, 2007; Seifert, 2000. Samson et al (2004) have a excellent presentation with a key, illustrations, discussions and descriptions of the species commonly found on foods and indoor environments. This will work very well for most species of Aspergillus found in indoor environments, but will be less useful for outdoor habitats, especially in the tropics.