Terminal leaf identification

[jrguevar]

Hello everybody! Ive got only one year with two dendrobiums and I still cant get a full grasp of how to determine the rest period for them; Ive read that a terminal leaf must appear to pinpoint the time the plant stops growing andv should start its rest period, but I havent seen a clear pic of how this terminal leaf looks like. I would really appreciate if someone could give some feedback from the leafs I currently have in two diferrent plants. Also if someone could help with some tips on how to determine which group a drendro belongs to (when you dont have flowers) it will be greatly apreciated
Thanks in advance!