| The bryophytes are a natural and ancient group of plants that appear sister to protracheophytes and tracheophytes. |
| During the Wenlock, the oldest known tracheophytes of the genus Cooksonia, appear. |
| The hydroid tissues, in particular, are the general run of moss water storage cells and are probably only remotely related to the xylem of tracheophytes. |
| All the dominant plants on Earth are included in the tracheophytes. |
| In explaining the evolution of tracheophytes, it has been suggested that a mutant form of green algae developed a primitive rootlike function with which to supply itself with water and minerals. |
| In following sections it describes archaea, bacteria, viruses, fungi, the protists, bryophytes, tracheophytes, gymnosperms and angiosperms. |
