These inconspicuous root-dwelling fungi may hold the secret to the evolution of all Dikarya.

Gardening · Published 3 October 2026 Swipe more like this →

In short: For 130 years, the genus Entorrhiza remained an evolutionary enigma. These fungi form subtle galls on the roots of sedges and rushes, hiding in plain sight. Recent molecular analysis suggests they represent a distinct phylum, Entorrhizomycota, potentially serving as the missing link in the history of the fungal kingdom.

The phylum Entorrhizomycota consists of a small, morphologically uniform group of fungi that function as obligate root parasites. They are primarily known for inducing the formation of galls on the roots of plants within the Cyperaceae and Juncaceae families. These galls, which are often pale when young and turn brown as they age, house coiled, septate hyphae that eventually develop into thick-walled teliospores. Because these infections produce no aboveground symptoms, many species likely remain undiscovered, hidden beneath the soil surface.

Phylogenetic research, including comprehensive five-gene analyses, has placed Entorrhiza in a unique position. It is currently hypothesized to be either a sister group to the entire subkingdom Dikarya—which includes the familiar Basidiomycota and Ascomycota—or a sister group specifically to the Basidiomycota. This placement is significant because the teliospore tetrads found in Entorrhiza may represent the ancestral prototype of the dikaryan meiosporangium. If this holds true, these fungi provide a window into the evolutionary transition from water-dispersal to air-dispersal mechanisms in early fungi.

The evolutionary history of the group is ancient, with a stem age estimated at approximately 560 million years, dating back to the late Neoproterozoic era. Despite this vast age, the phylum exhibits a surprisingly limited number of species and a restricted host range. Researchers suggest this discrepancy may be due to mass extinction events that claimed many lineages, or simply because our current catalog of these inconspicuous organisms is incomplete. The divergence between major orders like Talbotiomycetales and Entorrhizales is estimated to have occurred roughly 50 million years ago, with host-shift speciation likely driving their radiation during the Oligocene and Miocene epochs.

While they share structural traits with basidiomycetes, such as dikaryotic vegetative mycelium and specific cell wall features, their distinct reproductive modes and isolated phylogenetic placement justify their status as a separate phylum. By studying these root-dwelling parasites, scientists are gaining new perspectives on how the complex structures of modern fungi evolved over hundreds of millions of years.

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