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The theme of Green Plants is the astonishing diversity of forms which evolution has provided from the atmospheric carbon fixed by photosynthesis, the remarkable phenomenon which is basic to plant life. The record of plant life provides a striking instance of both genetic conservation and variation. The photochemistry of the thylakoid membrane is presumably basically the same today as it was at the dawn of plant life in pre-Cambrian times, and the genetical system controlling its development likewise essentially unchanged. The aim of Green Plants continues to be to foster this endeavor. The order of earlier editions of this work has been largely followed, except that the Psilotales, in keeping with current views, are now associated with the ferns, and the subclasses of the flowering plants are referred to as the Liliopsida and Magnoliopsida. Green plants : their origin and diversity is organized into 9 chapters, which are: General features of the plant kingdom; The subkingdom Algae: Part 1; The subkingdom Algae: Part 2; The subkingdom Algae: Part 3; The subkingdom Embryophyta: division Bryophyta (mosses and liverworts); The subkingdom Embryophyta (cont.): division Tracheophyta, Part 1; The subkingdom Embryophyta (cont.): division Tracheophyta, Part 2; The subkingdom Embryophyta (cont.): division Tracheophyta, Part 3; The subkingdom Embryophyta (cont.): division Tracheophyta, Part 4