Members to this Washington-based site have access to an ad-free version with print-friendly pages. Membership is cheap but this site can be used extensively without signing up. Enchanted Learning produces children's educational and fun web sites and games that are designed to be used by all. For educators this website gives ideas on family-friendly interpretation and how to simplify complex biological terms.
After submitting the term ‘tree fern’ in this site’s search engine it came up with 23 educational resources that describe and simply illustrate tree ferns. These resources are in a range of forms; glossaries based on habitat or subject, quizzes and picture dictionaries (these come in a variety of languages). Other searches may throw up print-outs of map outlines, life cycles and anatomy.