This postcard shows Swedish mushroom stamps from a booklet of six stamps issued 7 October 1978. The mushrooms shown are: Orange Russula, Common Puff Ball, Parasol Mushroom, Chanterelle, Cep and Clavaria.
Stamp booklets often contain se-tenant stamps which are stamps of different design or color printed adjoining one another in a strip or block. Se-tenant stamps began as issues of separate designs that were simply attached to one another, but have developed into issues where the stamps are part of a larger continuous design. (source: Wikipedia) These mushroom stamps are mainly separate individual designs, but the design elements of grass and leaves continue across stamp borders, tying the separate designs together.
This is a post for Sunday Stamps at Viridian's Postcard Blog