This week, we are exploring the underground and invisible networks of Colombia – along with some of its strangest and least-understood creatures: fungi. We'll be talking about zombie fungi, shamanic fungi and magic mushrooms, the Wood Wide Web, sunscreen spores, makeup fungi, and eco-warrior fungi – plus why this fascinating mega-science has been so neglected, and why it's more urgent than ever that mycology gets the awareness, resources, and respect that it deserves. Emily Hart interviews two of Colombia's top scientists and leaders in their fields: mycologist Aida Vasco is Assistant professor at the School of Microbiology at the University of Antioquia and Co-Chair of the Colombian Association of Mycology; botanist Mauricio Diazgranados is Chief Science Officer and Dean of the International Plant Science Center at the New York Botanical Garden. Mauricio led the Useful Plants and Fungi of Colombia project, including the development of the Colfungi portal and the Catalogue of Fungi of Colombia, on which Aida also worked. There are an estimated 300,000 species of fungi in Colombia, the huge majority of which are unstudied. In fact, fungi in general remains one of science's great mysteries: it is known as a 'neglected mega-science'. They change animal behaviour, connect the forests, feed humans and animals, and may even be a key weapon in the fight against climate change. Battling this vast gap in knowledge is the Useful Plants and Fungi of Colombia project - an initiative led by Royal Botanic Gardens, Kew in collaboration with the Humboldt Institute. The projects aim to increase, consolidate, and make accessible the knowledge of the country's useful plants and fungi for the benefit of local communities. Fungi have played a vital role in shaping the Earth's biosphere, and have directly impacted human society and its cultural evolution for the past 300,000 years - used as food, for ritualistic purposes, or as medicinal products. In Colombia, fungi - in the form of wild edible mushrooms - are primarily used as a nutritional source, having long played a role in the food security of indigenous people and local communities: representations are found in the iconography of several pre-Hispanic cultures throughout the country, showing knowledge and a close cultural relationship with fungi. Shamanic and spiritual uses are also common in the country. Habitat loss, habitat fragmentation, overuse of pesticides and fungicides, and of course climate change affect fungi as well as fauna and flora, but fungi are not explicitly included in biodiversity legislation, biodiversity action plans, and conservation policies in Colombia. The Colombian government only recognises three components of biological diversity: Fauna, Flora, and microorganisms. But there is cause for hope – we are only just starting to understand fungi but the field is gaining momentum, and experiments show their potential is even grander than we have imagined – they are not only a sustainable food source to fight hunger and the industrial food which accelerates climate change: mushrooms can also decompose waste – including nappies and cigarette butts, and can be used in 'myco-fabrication' - manufacture of e.g. architecture and furniture. They are incredibly adaptive, and provide ways for plants and animals to survive even in extreme and degraded environments.

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