Hemitrichia serpula      Pretzel Slime Mould

The mustard-yellow colour and network of thick veins make this species distinctive. 

The fruitbody consists of a network of swollen veins (plasmodiocarp) that cover several to many square cm and is yellow to mustard-yellow. The outer wall breaks down and the internal threads flounce out to form a cottony, mustard-yellow spore-containing mass. Widespread but not common, this distinctive slime mould fruits on wood and plant debris.