Macro # 4 What is it?

Probably not too difficult?

Grey and rainy today, so not too sad about this macro challenge...
The last two days I definitely was, as the weather was gorgeous. I will post some pictures of those two days on Flickr for those of you who are interested. last days of April

Tonight I will take blipping and commenting time. But already now I want to thank everybody who commented on my "ugly" piece of wood yesterday. You are so kind! It was even sprinkled with stars and a heart. So kind !!