Scientists have discovered 59 new fungal species and an entirely new genus in a major global study involving contributors from the Royal Botanic Gardens Victoria, revealing how much of Earth’s fungal diversity remains unexplored.

Published in Fungal Diversity, the research documents 98 fungal taxa collected across 19 countries, spanning Asia, Africa, Europe, the Americas and Oceania. Using DNA sequencing technologies alongside traditional taxonomy, the team identified species previously unknown to science and clarified how they are related.

A key finding of the study is the discovery of a new genus, named Fusicastoreum, which is endemic to Australia. Importantly, Fusicastoreum is not a single species but a newly defined group of fungi, within which the researchers also described several new species. This distinction highlights the scale of the discovery, identifying not just a single leaf in the fungal tree of life but an entirely new branch. Species of Fusicastoreum are mycorrhizal with eucalypts, meaning the fungi mutualistically associate with Eucalyptus roots to exchange nutrients. 

Overall, the study revealed 59 species new to science, alongside 13 taxonomic reclassifications, one new scientific name, and 24 new host or geographic records, significantly expanding current knowledge of global fungal diversity.

Fungi are essential to life on Earth, playing key roles in breaking down organic matter, recycling nutrients and supporting plant growth. Despite their importance, scientists estimate that millions of fungal species remain undiscovered. This research contributes to closing that gap, uncovering fungi from a wide range of environments including forests, freshwater systems, agricultural crops and extreme habitats.

The study also has practical implications. Some newly described fungi are associated with plants and crops, offering new insights relevant to agriculture and plant health. Others may hold potential for biotechnology, as fungi are known sources of useful compounds in medicine and industry.

The research forms part of the ongoing Fungal Diversity Notes series, a large international effort that has now introduced more than 1,900 fungal taxa to science. By combining global collaboration with cutting-edge genetic tools, scientists are building a clearer picture of fungal biodiversity and its role in sustaining ecosystems worldwide.