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Penicillium commune, Aureobasidium pullulans, and Paecilomyces farinosus were grown on two different media solidified with agar, Pluronic F-127, Carrageenan X-4910, or Carrageenan X-4910 overlaid with cellophane. Growth on Carrageenan X-4910 was generally the same as that on agar, as was the visual appearance of the colonies, e.g., the pigmentation. The Carrageenan X-4910 gels had a melting point, depending on the medium, of 41 to 46(deg)C, and the dry weights of the colonies were readily determined at 60(deg)C. To determine the dry weights of the colonies grown on agar plates, the gels were boiled for 10 min to melt the agar. Comparison of these two procedures showed that the boiling procedure resulted in a 22% reduction of the biomass dry weight. Cellophane membranes did not affect the radial growth rate profoundly. The biomass density was almost halved for P. commune and P. farinosus grown with membranes, whereas the presence of the membrane did not affect the biomass density of A. pullulans. The biomass densities of the colonies grown on Pluronic F-127 were significantly reduced, while in most cases, the radial growth rates of colonies grown on Pluronic F-127 were significantly higher than those obtained on agar or Carrageenan X-4910. Furthermore, the morphology of the leading hyphae was altered, and the hyphal growth unit length was more than twice that obtained on agar and Carrageenan X-4910. Carrageenan X-4910 is a valuable gelling compound for the study of the growth of fungi, as the biomass dry weight is readily determined and growth is similar to that obtained on agar gels.

Comparison of biomass dry weights and radial growth rates of fungal colonies on media solidified with different gelling compounds