A multi-petaled mounting member for an ostomy pouch comprising: (a) a flexible plastic member comprising a central body portion, a surrounding rim, and an outer perimeter, (b) a first double-sided adhesive substrate member comprising a first face, an opposite second face, and an outer perimeter, wherein (i) the outer perimeter of the first double-sided adhesive substrate member substantially corresponds in size and shape to the outer perimeter of the flexible plastic member, and (ii) the second face of the first double-sided adhesive substrate member is adhered to the central body portion and the surrounding rim of the flexible plastic member, (c) a second double-sided adhesive substrate member comprising a first face, an opposite second face, and a multi-petaled outer perimeter, wherein (i) the multi-petaled outer perimeter of the second double-sided adhesive substrate member has a size greater than the outer perimeter of the flexible plastic member and a shape corresponding to 2 to 8 petals extending radially from the second double-sided adhesive substrate member, distributed uniformly around the second double-sided adhesive substrate member, and separated by notches that expand radially from the second double-sided adhesive substrate member, wherein each of the 2 to 8 petals intersects angularly with each petal adjacent thereto, thereby defining the notches, and (ii) the second face of the second double-sided adhesive substrate member is adhered to the first face of the first double-sided adhesive substrate member, and (d) an adhesive skin barrier member comprising a first face, an opposite second face, and a multi-petaled outer perimeter, wherein (i) the multi-petaled outer perimeter of the adhesive skin barrier member substantially corresponds in size and shape to the multi-petaled outer perimeter of the second double-sided adhesive substrate member, and (ii) the second face of the adhesive skin barrier member is adhered to the first face of the second double-sided adhesive substrate member, wherein the 2 to 8 petals each have a width that first increases, then decreases, radially outwards from the second double-sided adhesive substrate member. (a) a flexible plastic member comprising a central body portion, a surrounding rim, and an outer perimeter, (b) a first double-sided adhesive substrate member comprising a first face, an opposite second face, and an outer perimeter, wherein (i) the outer perimeter of the first double-sided adhesive substrate member substantially corresponds in size and shape to the outer perimeter of the flexible plastic member, and (ii) the second face of the first double-sided adhesive substrate member is adhered to the central body portion and the surrounding rim of the flexible plastic member, (c) a second double-sided adhesive substrate member comprising a first face, an opposite second face, and a multi-petaled outer perimeter, wherein (i) the multi-petaled outer perimeter of the second double-sided adhesive substrate member has a size greater than the outer perimeter of the flexible plastic member and a shape corresponding to 2 to 8 petals extending radially from the second double-sided adhesive substrate member, distributed uniformly around the second double-sided adhesive substrate member, and separated by notches that expand radially from the second double-sided adhesive substrate member, wherein each of the 2 to 8 petals intersects angularly with each petal adjacent thereto, thereby defining the notches, and (ii) the second face of the second double-sided adhesive substrate member is adhered to the first face of the first double-sided adhesive substrate member, and (d) an adhesive skin barrier member comprising a first face, an opposite second face, and a multi-petaled outer perimeter, wherein (i) the multi-petaled outer perimeter of the adhesive skin barrier member substantially corresponds in size and shape to the multi-petaled outer perimeter of the second double-sided adhesive substrate member, and (ii) the second face of the adhesive skin barrier member is adhered to the first face of the second double-sided adhesive substrate member, wherein