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Abstract
Various factors were evaluated for their effect on the stability of colony characteristics of Penicillium aurantiogriseum, P. brevicompactum, P. citrinum, P. crustosum, P. glabrum, P. islandicum, and Eupenicillium hirayamae. The use of a lower density conidial suspension as the inoculum reduced the colony diameter of most strains, while it induced better sporulation in some strains. A 2 C difference in the growth temperature affected the colony diameter. Other factors, such as type of petri dishes, and the age and medium of slants for inoculation, were also discussed. Deviation in the colony diameters can be minimized to within 5 mm by considering the above factors.