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 (X), and extending from near the seating surface as far as an amorphous central zone , stiffening bosses 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 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 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 , <EOS>