The longest seedlings I currently own (not only by body length)...
Lithops pseudotruncatella ssp. groendrayensis C244
Why on God's green earth would you give a plant such a long name??? And there are worse: 'Lithops pseudotruncatella ssp. pseudotruncatella var. pseudotruncatella (syn. mundtii)'. That one's probably the longest.
Then again... they are going to be beautiful, so who cares?
Lithops pseudotruncatella ssp. groendrayensis seedlings on February 15, 2010