The number of chromosomes in the nucleus of the two spores, pollen-grain and embryo-sac, is only half the number found in an ordinary vegetative nucleus.
Eight chromosomes appear again in the ultimate divisions which give rise to the carpospores.
He finds no spindle fibres or true chromosomes, and considers the division direct, not indirect.
E, Chromosomes ox the spindle.
It has been suggested that synapsis may be connected with the early longitudinal splitting of the thread or with the pairing of the chromosomes, but it is possible that it may be connected with the transference of nucleolar substance to the nuclear thread.