Paleozoic Seeds with Embryos

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Science  12 Jan 1973:
Vol. 179, Issue 4069, pp. 184-185
DOI: 10.1126/science.179.4069.184


Seeds in a conifer cone from the Lower Permian of west Texas contain embryo tissue. These are the oldest plant embryos on record. Their development prior to seed dispersal shows that the sequence of embryo growth typical of most modern seed plants had evolved before the end of the Paleozoic Era.