%0 Journal Article
%A Su-Fang Huang
%A Su-Hwa Tsai Chiang
%T The Development of the Female Gametophyte In Isoetes Taiwanensis DeVol
%D 1986
%J Taiwania
%V 31
%N 1
%P 15-32
%U https://taiwania.ntu.edu.tw/abstract/549
%X The development of the female gametophyte in Isoetes taiwanensis DeVol is described. In the early stage of endosporic gametophyte development, the primary nucleus moves from base to apex and undergoes repeated nuclear division to form a free nuclear structure in the apical region. When there are only a few nuclei, the wall formation proceeds around the nuclei both basipetally and centripetally. Karyogenesis and cell wall formation could occur at the same time resulted in binucleate or multinucleate cells. In the full cellular stage, the relatively sharp border between the upper small celled and lower large celled area can be recognized. The lower large cells are rich in food particles. The first archegonial initial arises from a single superficial cell beneath the tri-ridge of the spore wall. The number of archegonia formed in each gametophyte is not constant ranging from 5 to 20. Rhizoids originated also from the superficial cells of the apical region are always on the exposed area after the spore wall breaks. The outgrowth of gametophytic tissue from megaspore wall mainly takes place in December to February indicating it might need cooler weather.
%M doi:10.6165/tai.1986.31.15