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Pollen grains of Pinus wallichiana, P. mugo, P. ponderosa and Ephedra distachya germinated at various intensities on in vitro cultured placentas of 32 angiosperm species. Pollen of the same gymnosperms did not form tubes on stigmas of pistils cultured under the same conditions as the placentas. Pollen of several angiosperms germinated on semi in vitro cultured opened ovules of Larix decidua and nucelli...
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