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Micrasterias is a unicellular green alga of the order Desmidiales.Its species vary in size reaching up to hundreds of microns. Micrasterias displays a bilateral symmetry, with two mirror image semi-cells joined by a narrow isthmus containing the nucleus of the organism.
Cells within circular regions within the perithallus lengthen to form sexual conceptacles, [8] leaving long, wefty cells around the walls of the conceptacle. [14] In the male conceptacles of Austrolithon , marginal filaments grow more quickly, bending in over the top of the conceptacle cavity and eventually setting up as distinct filaments that ...
Pandorina is a genus of green algae composed of 8, 16, or sometimes 32 cells, held together at their bases to form a sack globular colony surrounded by mucilage.The cells are ovoid or slightly narrowed at one end to appear keystone- or pear-shaped.
A few genera form non-filamentous colonies, with individual cells connected by threads or remnants of parent cell walls. [10] The cell of a desmid is often divided into two symmetrical compartments separated by a narrow bridge or isthmus, wherein the spherical nucleus is located. Each semi-cell houses a large, often folded chloroplast for ...
Haploid algal cells (containing only one copy of their DNA) can fuse with other haploid cells to form diploid zygotes. When filamentous algae do this, they form bridges between cells, and leave empty cell walls behind that can be easily distinguished under the light microscope. This process is called conjugation and occurs for example in Spirogyra.
Volvox is a polyphyletic genus of chlorophyte green algae in the family Volvocaceae. Volvox species form spherical colonies of up to 50,000 cells, and for this reason they are sometimes called globe algae. They live in a variety of freshwater habitats, and were first reported by Antonie van Leeuwenhoek in 1700.
The plant body is a gametophyte.It consists of the main axis (differentiated into nodes and internodes), dimorphic branches (long branch of unlimited growth and short branches of limited growth), rhizoids (multicellular with oblique septa) and stipulodes (needle-shaped structures at the base of secondary laterals).
The cells then meet and fuse to form a zygote, which later undergoes meiosis to produce new filaments. As in plants, only the female passes chloroplasts on to the offspring. [5] Other conjugating algae are the Mesotaeniaceae, sister of the Zygnematales, and Spirotaenia, a basal green algae.
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