Curated OER
Non-Seed Vascular Plants
In this non-seed vascular plant instructional activity, students review the characteristics of sporophytes, lycophytes, sphenophytes, and pterophytes. This instructional activity has 19 fill in the blank, 4 true or false, and 2 short...
University of California
Ucmp: Yesterday's Trees Today's Horsetails
Berkeley offers a brief introduction to these Sphenophyta. At the bottom of the page, you can go to sections such as fossil record, ecology/history and systematics.
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.
Other
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.