A finger of candle-snuff fungus (Xylaria hypoxylon) has emerged from the top of the sallow log looking, as I suppose it is meant to, like a snuffed out wick.
More poison pies (Hebeloma crustuliniforme) are appearing and the one in the picture below has grown quite large and it easy to see how it could be mistaken for a field mushroom. I have picked it before rapid decay sets in and have it in a container to see if I can breed any fungus gnats (Mycetophilidae) from it, but it does not look very promising. Perhaps the poison protects it.
The wintergreen annual hairy tare (Vicia hirsuta), now an occupant of the window box for several years, has managed to grow from one of the cracks on the top of the sallow log, but I rather doubt if it will get through to flowering after frosts and drought.
The rectangular orangey-yellow object bottom right is a chip of hawthorn wood throw out by a chain saw that was being used nearby. I thought dear reader you needed to know that.