Mould bottom for the manufacture, from a plastic preform, of a container comprising a body extending along a longitudinal axis between an opening and a bottom, the bottom having a seating surface forming a standing plane for the container, a concave arch, exhibiting symmetry of revolution about the longitudinal axis, and extending from near the seating surface as far as an amorphous central zone, stiffening bosses (16, 17) protruding from the concave arch and extending radially on the inside of the arch, said mould bottom being intended to be mounted so as to be able to move relative to walls of a mould, which are able to move relative to one another and are intended to form a body of the container, said mould bottom being intended to be able to move relative to the walls so as to form a bottom of the container by pushing the constituent plastic material of said container back towards its opening, characterized in that said mould bottom comprises: - a first annular part intended to form, at least in part, the seating surface; - a second part in the shape of a dome, intended to come into contact with an amorphous central zone of the preform so as to form the arch in such a way that the arch comprises two separate zones, namely a first zone and a second zone, which are separated by a level, and in such a way that the stiffening bosses (16, 17) are angularly spaced apart from one another, alternating first bosses and second bosses distributed according to a first annular band in which the first bosses extend from a first end near the seating surface as far as a second end, the first bosses forming a second annular band between their second end and the amorphous central zone, wherein the second end of the first bosses opens into the second zone at a distance from the level of between 25% and 65% of the total developed length of this second zone, and a third annular band in which the second bosses extend from a first end near the amorphous central zone as far as a second end, the second bosses forming a fourth annular band between their second end and the seating surface, wherein the second end of the second bosses opens into the first zone, at a distance from the level of between 25% and 65% of the total developed length of this first zone; the second part bearing: - a first annular band of protrusions intended to form the first bosses near the seating surface, a second annular band of protrusions intended to form the second bosses near the amorphous central zone. - a first annular part intended to form, at least in part, the seating surface; - a second part in the shape of a dome, intended to come into contact with an amorphous central zone of the preform so as to form the arch in such a way that the arch comprises two separate zones, namely a first zone and a second zone, which are separated by a level, and in such a way that the stiffening bosses (16, 17) are angularly spaced apart from one another, alternating first bosses and second bosses distributed according to a first annular band in which the first bosses extend from a first end near the seating surface as far as a second end, the first bosses forming a second annular band between their second end and the amorphous central zone, wherein the second end of the first bosses opens into the second zone at a distance from the level of between 25% and 65% of the total developed length of this second zone, and a third annular band in which the second bosses extend from a first end near the amorphous central zone as far as a second end, the second bosses forming a fourth annular band between their second end and the seating surface, wherein the second end of the second bosses opens into the first zone, at a distance from the level of between 25% and 65% of the total developed length of this first zone; - a first annular band of protrusions intended to form the first bosses near the seating surface,