How many to use: Succah 34b, 35a
Size of the Citron: Shabbat 81a; Succah 31b, 34a, 34b, 36b
Requirement that the citron be "Hadar [Beautiful]": Succah 31b
Identifying the citron as a species which remains on the tree for more than a single year: Succah 31b, 35a
Identifying which species is an "Etrog": Succah 35a
Using another species, in the absence of a Citron: Succah 31a, 31b
A dried-out Citron: Succah 31a-b, 34b
A green Citron: Succah 31b, 34a, 34b
A black Citron: Succah 34b, 36a
A white Citron: Succah 36a
A spotted Citron: Succah 36a
If the citron has a wart on a portion of it, or many small warts: Succah 34b, 35b
If there is a wart on the nose-end of the Citron: Succah 35b
If the "Pitom [nose]" is removed: Succah 34b, 35b
If the "Uketz [stem]" is removed: Succah 34b
A skinned Citron: Succah 34b, 35b-36a
A cracked Citron: Succah 34b
A pierced Citron: Succah 34b, 36a
If the Citron is pierced, but no part of it was removed: Succah 34b
A Citron with a piece missing, on the first day and on the rest of the holiday: Succah 34b, 36b
A Citron which was partially eaten, by people or by mice: Succah 36b
If the inside of Citron has dissolved into fluid: Succah 36a
A bloated Citron: Succah 36a
A rotten Citron: Succah 36a
A cooked/pickled Citron: Succah 36a
A Citron which is spherical: Succah 36a
A Citron which has a joined twin: Succah 36a
A stunted Citron: Succah 36a
A Citron which grew in a [malformed] mold: Succah 36a, 36b
A Citron from the year before: Succah 31b
Use of the Citron
Intentionally sniffing it: Succah 37b
Whether a Citron may be moved during the holiday, if it becomes invalid for the Mitzvah: Succah 46b
Use of the Citron on the 7th/8th day of the Holiday: Succah 46b
