I was very excited to spot this Striate Earthstar in my garden today! 
All of the Earthstars look like they’ve been dropped off by diddy spaceships, these ones are extra diddy.
They are ‘uncommon’ in the UK and are very difficult to spot due to their diminutive size and their ability to blend in with leaf litter and debris under trees and in hedgerows. You might find them under Leylandii in your garden. These were under Snowberry hedge though.
More info here: Geastrum striatum, Striate Earthstar fungus