The evergreen wood fern, also known as Dryopteris intermedia, is a common fern species that remains green and healthy throughout the year. However, there are several synonyms for this species that you may come across when reading botanical literature or researching ferns. Some of these synonyms include Dryopteris dilatata, Nephrodium dilatatum, Polystichum dilatatum, and Thelypteris dilatata. While these names may sound different, they all refer to the same plant species. The use of multiple synonyms for a species can be confusing, but it is important to understand that they reflect changes in nomenclature over time and do not represent different variations of the plant.