The octant proembryo ofEpithema carnosum Benth.
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The quadrant proembryo ofEpithema carnosum Benth. consists of a spherical mass of four cells of which two opposite ones appear trapezoid in cross-section and the rest triangular. The inner faces of the quadrants are straight partitions while the outer faces are curved and converge towards the polar furrow. The primary adjustment facet is a median strip of cell wall which separates the quadrants. A transverse division of the quadrants results in the formation of the octant proembryo. The transverse cell plates are laid down in planes of minimal area in accordance with Errera’s Law and at slightly varying levels so that not more than three partitions meet at one edge. Due to subsequent readjustment, four lateral furrows corresponding to four new transverse primary adjustment facets are formed. In addition, a hexagonal secondary adjustment facet is formed in the centre of the sphere and separating the octants. This is formed from a strip of original primary adjustment facet of the quadrant proembryo. The octants have five to nine faces after readjustments. The shapes of the octants are determined by both surface tension and growth.
KeywordsSoap Bubble Partition Wall Lower Tier Transverse Wall Spherical Mass
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