FIG. 2.   Isotopic discrimination by C. volvatus (Cv) and M. androsaceus (Ma) grown in closed liquid cultures on either C₃- or C₄-derived sucrose. Solid bars, medium; diagonally cross-hatched bars, fungal biomass; horizontally cross-hatched bars, CO₂. See the text for the definition of . See Table 1 for mass balance data. The difference between biomass and CO₂ was significant only for C. volvatus grown on C₄ sucrose (t test; P = 0.032). The _bf values are significantly different from a hypothesized value of 0.00 only for C₃ treatments (t test; P < 0.01).

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