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Principal component analysis (PCA) performed on Bruvo's distances on the whole collection of P. ×alni (269 isolates). Symbols indicate P. ×multiformis and P. uniformis putative parents: ○, P×m-1 or P×m-2; □, P×m-2 or P×m-4; △, P×m-1, P×m-2, or P×m-5; ▽, P×m-2; ♢, P×m-4; +, undetermined. Black filled symbols, Pu-E1 or Pu-E3; empty symbols, Pu-E2; gray filled symbols, undetermined P. uniformis putative parents. The numbers indicate the P. ×alni MLGs.
