Self‐pollination of 2f species of vandaceous orchids was followed by later embryo culture carried out to determine which species are self‐compatible (SC) or incompatible (SI): 10 are SC, 1 are SI and the remaining:8 require further study. In the SI species, a few progeny could usually be recovered and these are interpreted as arising from mutation at the incompatibility locus (loci). The implications of the findings for current models of incompatibility are discussed.

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