Studies in the Lentibulariaceae 8. The Development of Gametophytes in Utricularia dichotoma Labill.

SummaryThe ovules are anatropous, unitegminal and tenuinucellate. Nutritive tissues differentiate at the chalaza and in the funicle. The megaspore tetrads are linear and sometimes T-shaped or inverted T-shaped. The megaspore tetrads which can not be classified by the usual terminology may occasionally develop. The development of female gametophyte conforms to the Polygonum type. Twin embryo sacs at different stages of development have been observed. The anther wall layers develop according to the Basic type of Davis (1966). The microspore tetrads are generally tetrahedral and occasionally decussate. The pollen grains are shed at 3-celled stage.