“…It is known that mycoheterotrophic orchids tend to have a higher abundance of 13 C and 15 N than co‐occurring C 3 plants (Bidartondo et al, ; Hynson et al, ; Lee, Yang, & Gebauer, ; Martos et al, ; Ogura‐Tsujita, Gebauer, Hashimoto, Umata, & Yukawa, ), since the ectomycorrhizal or saprotrophic fungi that sustain them have higher relative 13 C and 15 N abundances than neighbouring C 3 plants (Gebauer & Meyer, ; Selosse & Roy, ). Furthermore, partially mycoheterotrophic species, which combine autotrophy and mycoheterotrophy, tend to exhibit 13 C and 15 N abundance profiles midway between those of fully mycoheterotrophic species and autotrophic ones (Gebauer & Meyer, ; Selosse & Roy, ; Suetsugu, Ohta, & Tayasu, ; Suetsugu et al, ). Interestingly, these partially mycoheterotrophic species often associate with ECM‐forming fungi, indicating that the ultimate source of their carbon is the photosynthate produced by the nearby trees (Hynson et al, ; Selosse & Roy, ).…”