Aspergillus terreus

Entry in species database

Appearance of colonies

CYA:   40-50 mm diam, plane, low and velutinous, usually quite dense; mycelium white; conidial production heavy, brown (Dark Blonde to Camel, 5-6D4); reverse pale to dull brown or yellow brown

MEA:   40-60 mm diam, similar to those on CYA or less dense

G25N:   18-22 mm diam, plane or irregularly wrinkled, low and sparse; conidial production light, pale brown; brown soluble pigment sometimes produced; reverse brown

Appearance of conidia

Conidial heads are compact, columnar and biseriate. Conidiophores are hyaline to slightly yellow and smooth walled. Conidiophores borne from surface hyphae, stipes 100-250 µm long, smooth walled; vesicles 15-20 µm diam, fertile over the upper hemisphere, with densely packed, short, narrow metulae and phialides, both 5-8 µm long; conidia spherical, very small, 1.8-2.5 µm diam, smooth walled, at maturity borne in long, well defined columns. Distinctive featuresVelutinous colonies formed at both 25°C and 37°C, uniformly brown, with no other colouration, and minute conidia borne in long columns make Aspergillus terreus a distinctive species

Temperature and growth

No growth at 5°C

Colonies at 37°C growing very rapidly, 50 mm or more diam, of similar appearance to those on CYA at 25°C

Sclerotia

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Electron micrographs of A. terreus conidia & conidial heads provided by Amaliya Stepanova, Head of Laboratory pathomorphology and cytology at Kashkin Research Institute, Russian Federation.


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