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It is contained in a seed-vessel formed from the ovary in the plants called angiospermous; while in gymnospermous plants, such as Coniferae and Cycadaceae, it is naked, or, in other words, has no true pericarp.

It was not even, like that of the coal period, solely or mainly cryptogamous or gymnospermous.

Very similar would seem to have been the fate of a more familiar gymnospermous tree, the Gingko or Salisburia.

The general relation of the gymnospermous Seed-plants to the Higher Cryptogamia was cleared up, independently of fossil evidence, by the brilliant researches of Hofmeister, dating from the middle of the past century.

It remained uncertain, however, from which line of Cryptogams the gymnospermous Seed-plants had sprung.