chlorophyta

Division :Chlorophyta
Order 7 :Dasycladales
Family : Polyphysaceae
Genus : Acetabularia


• is a genus of green algae, Typically found in subtropical waters, it is a single-celled organism, but gigantic in size and complex in form making it an excellent model organism for studying cell biology .
• it is 0.5 to 10 cm tall and has three anatomical parts: a bottom rhizoid that resembles a set of short roots; a long stalk in the middle; and a top umbrella of branches that may fuse into a cap .
• Acetabularia are among the largest single-celled organisms, having also a remarkably large nucleus. During sexual reproduction, the nucleus undergoes multiple rounds of mitosis, forming many daughter nuclei all within one nuclear membrane. These nuclei undergo meiosis and are transported to the tips of the branches, the sporangia, where they are released as gametes.


Division :Chlorophyta
Class: Bryopsidophyceae
Order : Bryopsidales
Family : Bryopsidaceae
Genus : Bryopsis


Broypsis forms soft, feathery clumps attached to basalt rocks and rubble on shallow reef flats, in seas with low wave action .
Thallus filamentous, bushy, to 10 cm high. Fronds feather-like, 8 - 15 mm wide, pinnately branched; lateral branches of uniform length, constricted at base where joined to main axes. Branchlets in two opposite rows on upper half of branch . Rhizoidal system is fibrous. Color is glossy dark green, often with light blue iridescence .
Vegetative pennae function as the gametangia. Plants are dioecious, with male plants becoming yellowish-green and female plants turning dark green .
Bryopsis species are potentially invasive. the genus produces chemical defenses that are toxic to most herbivorous organisms and easily reproduces vegetatively from the smallest fragments. Therefore, if environmental conditions occur that support fast growth of this species, it may become more competitive and possibly dominant .