Abstract: A toilet tissue dispensing mechanism includes a unit formed by a pair of parallel vertical walls. Each wall includes vertically spaced openings arranged such that the openings of each wall are in vertically staggered relationship with the openings of the other wall when the movable wall is closed. Each opening has a roll-mounting structure associated therewith, whereby each wall is capable of concurrently dispensing a pair of tissue rolls. Each roll-mounting structure includes a shield mounted for swinging movement between open and closed positions for securing the rolls in their respective openings. To convert such a mechanism to a dispenser which dispenses rolls sequentially rather than concurrently, the shields are swung to their open positions, and adapter plates are positioned against inside surfaces of respective ones of the walls to cover the openings therein. The plates are pressed against the respective walls by edges of the shields.