To remove the harmful effects of the Descolada for humans and other non-Lusitanian species, the Recolada was structured exactly like the Descolada but without the ability to change the biology of other organisms.
Since it was physically impossible to modify an existing Descolada cell into the Recolada, a trip to Outside was required to create the Recolada. Ela Ribeira created the Recolada with her mind while Outside, and brought it back to the planet.
Before spreading it to the entire ecosystem, Ela and the other xenobiologists tested if the new virus would work with the Pequenino biology by "planting" Glass. After Glass sucessfully became a Fathertree, the Pequeninos consented to sending out the Recolada. It was spread throughout Lusitania along with another virus that would kill off existing Descolada cells.