| These are Figures 1 (left) and 2 (right) from Palmer et al. (2004). Figure 1 generally follows Keeling (2004) and indicates where secondary photosynthetic symbioses occurred in the various eukaryotic lines. Note that they call the primary photobionts Primoplantae. Figure 2 shows a post-2003 tree of the embryophytes. Note that the fern clade includes the whisk ferns (psilophytes) and horsetails and that the gnetophytes emerge within the conifer taxa. The bryophytes emerge as an ambiguous polytomy. Note also the complex nature of the angiosperms. | |
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