In which publication ? Could you provide the reference or quote the text ?
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Dressler wrote : "... "adventitious" buds that give rise to new shoots may be produced on roots, as in Listera, Pogonia, Psilochilus, or Phalaenopsis. Such roots are superficially much like the slender root-stem tuberoids of some Orchidinae, but they are anatomically distinct, lacking the core of stem structure."
(Phylogeny and Classification of the Orchid Family, p. 18)
******* Regards,
Viateur
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