Biology Pages
Kimball's Biology Pages: Mosses and Liverworts
A lesson on the classification of mosses and liverworts as well as the physical make up and similarities of the species.
Ohio State University
Ohio State University: Bryophyta (Mosses)
This general overview of mosses is concise, with good diagrams and illustrations. The text is written at a higher level, but the information to gain is worth taking some time.