These ancient plants have survived 380 million years by holding onto their genetic past

Gardening · Published 3 October 2026 Swipe more like this →

In short: Lycopodiaceae, or clubmosses, are living fossils that emerged during the early Devonian period. Unlike modern flowering plants, these vascular organisms reproduce via oily, flammable spores rather than seeds. Their remarkable evolutionary stability means they have retained duplicate genes for hundreds of millions of years, defying typical botanical patterns of loss.

The Lycopodiaceae family comprises approximately 400 to 500 known species of clubmosses and firmosses. These plants are defined by their microphylls—small leaves containing a single vein—and their habit of producing spores within a specialized structure called a strobilus. While they are cosmopolitan in distribution, they are most prevalent in tropical mountain and alpine environments, typically growing to heights of 5 to 20 cm. Because they are not spermatophytes, they do not produce seeds, relying instead on a life cycle that often involves a non-photosynthetic, myco-heterotrophic gametophyte.

Evolutionarily, the family is exceptionally conservative. Having diverged from other lycophytes around 400 million years ago, the subfamilies Lycopodioideae and Huperzioideae split roughly 350 million years ago. Remarkably, these plants have evolved so slowly that about 30% of their genes remain in their original syntenic blocks. Furthermore, unlike most plants that undergo diploidization to shed duplicate genes following whole genome duplication, Lycopodiaceae tend to retain both sets of genes with minimal alteration over vast timescales. This genetic persistence is a hallmark of their lineage.

Taxonomic classification of the family remains a subject of ongoing debate. While the Pteridophyte Phylogeny Group (PPG I) recognizes 16 genera grouped into three subfamilies—Lycopodielloideae, Lycopodioideae, and Huperzioideae—other systems use broader definitions, sometimes collapsing these into just three genera. This uncertainty is compounded by the fact that many species have been reclassified multiple times. Beyond their scientific interest, these plants have historical utility; their flammable spores have served as flash powder and violin pore filler, while certain species have been used in festive greenery or traditional folk remedies.

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