Kew scientists discovered nearly 100 new plants and fungi last year - but some may already be extinct.

From an underground "forest" to spectacular orchids, scientists at the Royal Botanic Gardens, Kew, discovered 74 new plants and 15 fungi last year.

Many of the mysterious species were found in unlikely places, such as on the top of a volcano or clinging to Antarctic rocks.

The new finds need immediate protection and at least one will probably already have been lost, the scientists say.

About three-quarters of undescribed plants are threatened with extinction.