Wood ferns are ancient survivors that have been evolving for 100 million years
In short: Known as wood ferns, the Dryopteridaceae family is a cosmopolitan group of about 1,700 species. These resilient plants have thrived since the Mid-Cretaceous, adapting to terrestrial and epiphytic lifestyles alike. While they are popular in gardens today, their complex evolutionary history continues to challenge modern botanical classification systems.
The Dryopteridaceae, or wood ferns, represent a massive, diverse family within the order Polypodiales. With roughly 1,700 species distributed globally, they exhibit remarkable versatility in their habitats, ranging from terrestrial growth to life as epiphytes perched on other plants. Their evolutionary journey is deep; molecular evidence suggests the family diverged from other eupolypods I about 100 million years ago, with the fossil record confirming their presence by approximately 99 million years ago.
Botanical classification of these ferns has been a moving target. In 1990, researchers proposed a broad definition of the family that later molecular studies proved to be polyphyletic, leading to a significant reorganization in 2006. Today, the Pteridophyte Phylogeny Group classification of 2016 recognizes the family as a distinct entity, though debates persist regarding the inclusion of specific genera like Didymochlaena, Hypodematium, and Leucostegia. These are now frequently moved to their own separate families, such as the Hypodematiaceae, to ensure the Dryopteridaceae remains a monophyletic group.
The family is dominated by four major genera—Elaphoglossum, Polystichum, Dryopteris, and Ctenitis—which together account for about 70% of all known species. Their physical structure is characterized by stout rhizomes and fronds that are typically monomorphic. Ongoing phylogenetic research continues to refine their taxonomy, with studies as recent as 2013 sinking smaller genera into larger ones based on DNA evidence. This constant revision highlights the difficulty of mapping the lineage of such an ancient and widespread group of plants.
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- Summary by Intellect · source: Dryopteridaceae
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