Thank you, hys! I guess you mean the small white spots on top of the mushroom that are so particular for this species. They develop later, when the mushroom gets bigger! https://static.foto.no/linkeddata/bildekritikk/images/newimages/1075000-1075999/1075005_large_7105D1E2-9DCB-11E7-816E-D7BE8B4C0282.jpg