<P> Evidence for the appearance of the first land plants occurs in the Ordovician , around 450 million years ago , in the form of fossil spores . Land plants began to diversify in the Late Silurian , from around 430 million years ago , and the results of their diversification are displayed in remarkable detail in an early Devonian fossil assemblage from the Rhynie chert . This chert , formed in volcanic hot springs , preserved several species of early plants in cellular detail by petrification . </P>
<P> Evidence for the appearance of the first land plants occurs in the Ordovician , around 450 million years ago , in the form of fossil spores . Land plants began to diversify in the Late Silurian , from around 430 million years ago , and the results of their diversification are displayed in remarkable detail in an early Devonian fossil assemblage from the Rhynie chert . This chert , formed in volcanic hot springs , preserved several species of early plants in cellular detail by petrification . </P>
when did plants begin to appear on land
when did plants begin to appear on land
around 450 million years ago
around 450 million years ago