Fungi

The UK hosts an incredibly rich and diverse fungal kingdom, with estimates suggesting around 12,000–15,000 species of fungi (including mushrooms, brackets, moulds, yeasts, lichens in part, and microscopic forms). This makes fungi more diverse than vascular plants in Britain. Many species are still being discovered or re-assessed as recording improves.Ecological RolesFungi are essential to UK ecosystems:

• Decomposers — They break down dead wood, leaves, and organic matter, recycling nutrients that plants need. Without them, woodlands and grasslands would become buried in undecayed material.
• Mycorrhizal partners — The majority of UK trees and many wildflowers form symbiotic relationships with mycorrhizal fungi (especially ectomycorrhizal species with oaks, birches, pines, and beeches). These create vast underground networks (sometimes called the “Wood Wide Web”) that help plants exchange nutrients, water, and even chemical signals.
• Pathogens — Some species cause diseases in plants/trees (e.g., ash dieback is linked to the fungus Hymenoscyphus fraxineus), helping regulate ecosystems by preventing single species dominance.
• Specialised habitats — Waxcaps and other grassland fungi thrive in unimproved meadows (now very rare), while ancient woodlands support specialist wood-decay species.

Fungi found in Highfield Park.

Conservation and Threats.

• Habitat loss — Intensification of agriculture has destroyed species-rich grasslands and woodland management changes and development also impact specialised species.
• Pollution — Nitrogen deposition from agriculture and air pollution harms many mycorrhizal and grassland fungi.
• Climate change — Alters fruiting patterns and may favour invasive species.
• Undervaluation — Fungi were historically under-recorded and under-protected compared to flora and fauna.

Fungi are finally getting more attention as keystone organisms — healthy fungal communities are vital for resilient woodlands, carbon storage, tree planting schemes, and overall biodiversity. If you’re in the UK, autumn (especially after rain) is the prime time to see fungi but please photograph rather than pick.