2018年12月30日 · Selaginella is heterosporous, hence it produces two types of gametophytes, viz., microgametophyte i.e., male gametophyte from microspore and megagametophyte i.e., female gametophyte from megaspore. Thus gametophytes are dioecious (heterothallic).

2024年10月8日 · The plant body of Selaginella is a sporophyte that exhibits clear differentiation into roots, stems, leaves, ligules, and rhizophores. Each of these structures plays a vital role in the plant’s development and functionality.

Selaginella is a sporophytic plant (2x) and produces two different types of spores i.e., microspores and megaspores. In other words we may call it as heterosporous plant. These spores on germination produce male and female gametophytes (x) respectively which in turn developing upon the strobilus of parent produce antherozoids and egg in ...

2024年10月3日 · In S. selaginoides, the branching of the young sporophyte is dichotomous whereas the lateral branches arise due to monopodial branching. The leaves are microphyllous. Each leaf is traversed by a single unbranched midrib. The leaf traces do not have any leaf gaps in the stem stele. The ligule arises from the base of each leaf.

Members of the genus Selaginella are heterosporous, meaning they produce two different types of spores. Figure \(\PageIndex{1}\): In the first image, there are liquid-preserved strobili of Selaginella, showing mega- and microsporangia through translucent sporophylls. The second image is a cross section through a strobilus.

The main plant body is a diploid sporophyte and is differentiated into true roots, stem and leaves. Selaginella is heterosporous, i.e. it produces two kinds of spores; microspores and megaspores. Spores are haploid and produced by meiosis in the spore mother cells.

The Sporophyte: The plant body of Selaginella is differentia­ted into well developed roots, stem and leaves. Besides, some species also have rhizophore (Fig.7.46A). Hieronymus (1902) divided the genus Selaginella into two sub-genera viz., Homoeophyllum and Heterophyllum on the basis of general structure of the plant body (Table 7.4). Stem:

Sporophyte of Selaginella 3. Gametophyte 4. Phylogeny. Selaginella is commonly called the spike moss. It includes over seven hundred species and reported practically from all parts of the world. Majority of the species occur in tropical rain forests and form a characteristic undergrowth on the ground in humid shady habitats.

2020年7月6日 · Sporophyte of Selaginella reproduce both by vegetative means by production of spores. 1. Vegetative reproduction- vegetative reproduction takes place by following methods- a) Fragmentation- it is affected only in species that grow under humid condition.

Most of the Selaginella species are heterosporic and some are homosporic. In heterosporic species, the strobilus bears two types of sporophylls, i.e., MICROSPOROPHYLLS and MEGASPOROPHYLLS .