Ohio State University
General Plant Biology: Seedless Vascular Plants
Use this very concise summary except to become familiar with these examples of less complex plants. Some of the terminology is at a more advanced level.
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Ohio State University: Cryptogamia (Seedless Plants)
Psilophyta, lycophyta, sphenophyta, are the three divisions of plants depicted in this focused site. Examples of each division is provided along with pictures.