GROWTH 43 



by centrifuging and measuring the volume of cells, by turbidity, or by 

 weighing. The most direct way of measuring growth of either yeast or 

 filamentous fungi is by weighing the crop produced. The various meth- 

 ods of measuring growth are not strictly comparable. 



The morphology of a fungus may be changed by environmental factors 

 so that it becomes unrecognizable. The processes of cell elongation and 

 cell division are controlled by different enzyme systems. In some 

 instances it has been possible to inhibit cell division without interrupting 

 cell elongation. Frequently a change in physiology accompanies a 

 change in morphology. 



REFERENCES 



*Barnett, H. L., and V. G. Lilly: The interrelated effects of vitamins, temperature, 

 and pH upon vegetative growth of Sclerotinia camelliae, At7i. Jour. Botany 35: 

 297-302, 1948. 



Bennett, I. G.: Thesis, West Virginia University, 1951. 



Buchanan, R. E., and E. I. Fulmer: Physiology and Biochemistry of Bacteria, 

 Vol. I, The Williams & Wilkins Company, Baltimore, 1928. 



Burkholder, p. R., and E. W. Sinnott: Morphogenesis of fungus colonies in sub- 

 merged shaken culture. Am. Jour. Botany 32: 424-431, 1945. 



Crosier, W.: Studies in the biology of Phytophthora infestans (Mont.) de Bary, 

 Cornell Univ. Agr. Expt. Sta. Mem. 155, 1933. 



Day, D., and A. Hervey: Phycomyces in the assay of thiamine in agar. Plant 

 Physiol. 21 : 233-236, 1946. 



Elfving, F.: Studien iiber die Einwirkung des Lichtes auf die Pilze, Helsingfors 

 Central-Druckerei, Helsingfors, 1890. 



Emerson, S.: The growth phase in Neurospora corresponding to the logarithmic 

 phase in unicellular organisms, Jour. Bad. 60: 221-223, 1950. 

 *Fawcett, H. S. : The temperature relations of growth in certain parasitic fungi, 

 Univ. Calif. (Berkeley) Pubs. Agr. Sci. 4: 183-232, 1921. 



Foster, J. W.: Chemical Activities of Fungi, Academic Press, Inc., New York, 1949. 



Fries, N.: Die Einwirkung von Adermin, Aneurin und Biotin auf das Wachstum 

 einiger Ascomyceten. Symbolae Botan. Upsalienses 7(2): 1-73, 1943. 



Fries, N.: Ophiostoma multiannulatum (Hedge, and Davids) as a test object for the 

 determination of pyridoxin and various nucleotide constituents. Arkiv fiir 

 Botanik 1: 271-287, 1949. 



Gortner, R. a.: Outlines of Biochemistry, 3d ed., John Wiley & Sons, Inc., New 

 York, 1949. 



Haenseler, C. M.: The effect of salt proportions and concentrations on the growth 

 of Aspergillus niger, Am. Jour. Botany 8: 147-163, 1921. 

 *Haskins, R. H., and W. H. Weston, Jr.: Studies in the lower Chytridiales. I. Fac- 

 tors affecting pigmentation, growth, and metabolism of a strain of Karlingia 

 (Rhizophlyctis) rosea, Am. Jour. Botany 37 : 739-750, 1950. 



Hawkins, L. A.: Growth of parasitic fungi in concentrated solutions, Jour. Agr. 

 Research!: 255-260, 1916. 



JiLLSON, O. F., and W. J. Nickerson: Mutual antagonism between pathogenic 

 fungi. Inhibition of dimorphism in Candida albicans, Mycologia 40: 369-385, 

 1948. 



Kroemer, K., and G. Krumbholz: Untersuchung iiber Osmophile Sprosspilze. 

 I. Mitteilung, Beitrage zur Kenntniss der Garungsvorgange und der Garungs- 

 erreger der Trockenbeerenauslesen, Arch. Mikrobiol. 2: 352-410, 1931. 



