I have no idea what it is but whatever it is, I wouldnt think twice about removing them.

Mike

Looks like a fungal growth on the oak of the barrel you have it planted in; I doubt it is a factor with the tree.

I would take it off; and then scrub the oak with a mild Clorox solution... very mild.

Full sun will help, if it is in fact a wood fungus.

I'd like to see an image without so much reflected light and (here's the big thing) I'd like to see what it looks like when you cut it in half. Close ups.

yeah, too much light, can't see any kind of details on it.

looks a bit like some insect egg sacs.

It is an oak fungus... there are a thousand fungi that adore oak; it is one of many reasons I never advise people to plant Meyers in oak barrels. The important thing is it is not likely impacting the citrus, so "Don't worry, be happy"

Thanks to everyone for your help! Those of you that are saying it is an oak fungus, it is pretty hard. Is that normal for a fungus to be hard and crusty? I tried cutting one in half and it just disintegrated on me...Nothing of substance was inside when it did. It was just like breaking up a dirt dobber nest. Here is another picture of the same one. Oddly enough it had turned pink by the time I got home from work. Either way, I'll just get rid of them. Just wanted to try and find out what it was before I did.

http://tinypic.com/r/k1vp77/5