Elektronenmikroskopische Untersuchungen über zwei auffallende Strukturen an der Geißelbasis der Spermatiden von Marckantia polymorpha, Preissia quadrata, Sphaerocarpus Domellii, Pellia Fabroniana (Hepaticae)
Two plasmatic, superimposed structures in the base of the flagellae at the ends of spermatids of liverworts were discovered electronmicroscopically. The upper, designated as the "Three group", consists of three parts, which always occur in the same order: (1) A double spiral (200-250 A wide, their wavy lines 60 A thick), (2) an equally broad, cross or diagonally striped part (stripes about 40 A wide), (3) a part half as wide with a structure difficult to define. Connected with this three group toward the interior of the cell is a body filled with vacuoles and surrounded by a double membrane. This three group is interpreted tentatively as the longitudinally sectioned base of the flagellum extending into the plasma, the vacuole-filled body as a blepharoplast, and its possible homology with a chondriosome is pointed out (double membrane, the inward bending of the inner to form tubuli or blastula).