Is this some kind of damping off?
This year I've had a number of my seedlings come up "headless" as in just the sprout and no leaves. Then several come up with a thread-like leaf on one side or both. There are no obvious seed coat problems that I can tell. I know they won't survive like that but the stems aren't wilted or sickly looking as of right now. I just wondered if this was some kind of damping or other disease. I've had a couple of headless seedlings in the past but not to this extent nor have I seen the strange little leaves before. I'll try to get a picture tomorrow. Lori