NUTRITIONAL REQUIREMENTS OF THE ROOT-ROT FUNGUS, PHYMATOTRICHUM OMNIVORUM

Abstract
P. omnivorum was grown in various synthetic culture solns. Ions utilized were PO4, K, Mg, and probably SO4. Other ions were apparently supplied in sufficient quantities as impurities. N was utilized equally well from amino acids, peptones, urea, and NH3 and NO3 compounds. Carbohydrate sources utilized were pentose and hexose monosaccharides, di-saccharides, starch, and mannitol. Growth was equally good in various dextrose concs. Best growth was obtained in alkaline solns. but was also good at pH 3.7. At pH 3 growth was inhibited. Carrot juice added to the media resulted in a large increase in growth.