154 ANNALS NEW YORK ACADEMY OF SCIENCES FIGURE 1. Arithmetic plot showing relationship of endogenous 14 C loss from labeled sclerotia of Sclerotium rolfsii to their ability to germinate in nutrient medium (potato-dextrose broth; PDB) or on salts solution containing no nutrients (y = 143.9-2.7x for PDB; y = 111.8-2.4x for the salts solution). Sclerotia of differing 14 C contents were obtained by incubating them in soil for various periods of time. Source: Ref. 10.