This is a fairly simple design so can be made from all sizes (the ones pictured are from 8.5cm to 15cm squares) and all types of paper even thin magazine pages . I found it difficult to decide what to do with the triangular flaps which cover the centre. I finally decided to curve them upwards and inwards to give the impression of a split seed pod.
The folding sequence includes 4 'butterfly' locks which create a cone shape. There is something strangely satisfying about a butterfly lock (maybe I should get out more!): you make a few creases, fold the edge to the centre incorporating a crimp and you have an instant neat 3D model.
The fact that it originated from a doodle and is not a deliberate attempt to imitate Nature made it difficult to choose a name for the model but I stumbled across a picture of a curious looking fungus called an earthstar and although not entirely similar the name has a good ring to it so "Earthstar" it is.