St George and the Egg Yolk
One of my hobbies is mushroom hunting. There are plenty of St George's Mushrooms around campus at the moment (they are named after St George's Day around which they appear). They were very tasty fried in butter. Now they've been out for about a fortnight and the heavy rain and maggots have got to them.
I also found a surprising little luminous yellow mushroom which goes, unsurprisingly when you see it, as 'Egg Yolk Fungus' (Bolbitius vitellinus - a nice Australian version here from which the second photo comes). But not edible.
One always has to be very careful what one eats. I was very pleased to find that the superb Roger Phillips guide is now free on line and even includes recipes.