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TABLE 1. C mass balances for closed-system incubations for two fungal species on C₃- and C₄-derived sucrose

Sugar Species C mass balance (g)
% of original C recovered % of original C used Expected medium $delta$ ¹³C Observed medium $delta$ ¹³C

Blank medium Medium Fungus^a Respired CO₂

C₃-derived sucrose C. volvatus 0.440 ± 0.017 (16)^b 0.421 ± 0.160 (3) 0.018 ± 0.002 (3) 0.012 ± 0.002 (3) 102.6 ± 3.3 6.8 ± 0.6 $-$ 22.011 ± 0.044 $-$ 22.829 ± 0.096

M. androsaceus 0.440 ± 0.017 (16) 0.383 ± 0.007 (3) 0.021 ± 0.003 (3) 0.018 ± 0.001 (3) 96.3 ± 2.7 9.1 ± 0.8 $-$ 22.712 ± 0.029 $-$ 22.539 ± 0.060

C₄-derived sucrose C. volvatus 0.438 ± 0.015 (10) 0.383 ± 0.019 (3) 0.023 ± 0.003 (3) 0.014 ± 0.000 (3) 96.0 ± 3.6 8.6 ± 0.7 $-$ 11.132 ± 0.030 $-$ 11.045 ± 0.013

M. androsaceus 0.438 ± 0.015 (10) 0.348 ± 0.020 (3) 0.025 ± 0.005 (3) 0.018 ± 0.004 (3) 89.5 ± 5.5 10.0 ± 0.7 $-$ 11.135 ± 0.002 $-$ 11.007 ± 0.025

^a The original fungal inoculum contained less than 0.5 × 10⁶ g of C.

^b The numbers in parentheses are numbers of replicates.

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