fungus

This is a significant problem because each oak tree supports up to 2,300 species of wildlife including birds, mammals, fungi and insects - the most of any native UK tree - according to the Woodland Trust.

It might put you off mushroom pizza to know this, but scientists recently found that some fungi might possess memory and decision-making abilities, if not actual consciousness.

In the U.S., foreign mussels are wreaking havoc in the Great Lakes, invasive fungi are threatening trees in Hawaii and non-native carp are invading rivers and lakes.

Deadwood-decomposing fungi feed germinating orchids, providing the carbon their tiny seeds don't have.

Plantlife's annual survey found hundreds of new sites for pink waxcap and violet coral across the country, with North Yorkshire emerging as a "hotspot" for the fungi, the charity said.