Identifying fungus

[pluton]

Looks dangerous! Maybe I'll adapt the idea with something wood and softer plastic so I don't get scratches if all goes bad.

It would be dangerous...if you didn't securely attach a substantial wad of lens tissue to it before using it.  That alligator clip is really strong...no tissue or cloth will escape its grasp.

[MFloyd]

I'm simply using Q-tips, invented by Harold De Coninck a certain twentieth of July, 1914.... and readily available in every store (brrrrrrr, the welding rod with crocodile ....). 😉

[FGAng]

The almost pretty fungus...

[Erik Lund]

Very clear! Thanks!

Indeed beautiful shot

[Matthew Currie]

on which elements? 

I can't quite remember now, but I think behind the front element mostly, but some toward the rear.  I took it in when it was pretty minor, and promptly forgot exactly where.