Where is Polysiphonia found?
Polysiphonia is commonly found as an epiphyte on plants and lithophyte on rocks in brackish estuaries in the intertidal and sublittoral regions. Most species prefer quiet waters whereas some are found in rough or even polluted waters.
What is the nature of cystocarp in Batrachospermum?
The gonimoblast branches out, and the terminal cells of such branched gonimoblast grow into carposporangia. Each carposporangium generates a unique single haploid carpospore that is rounded. The cystocarp or carposporophyte is a structure of gonimoblast filaments, carposporangia, and carpospores.
What is cystocarp in biology?
A cystocarp is the fruiting structure produced in the red algae after fertilization, especially such a structure having a special protective envelope (as in Polysiphonia). The structure from which carpospores are released.
Which algae is fruiting body cystocarp?
A cystocarp is the fruiting structure produced in the red algae after fertilization, especially such a structure having a special protective envelope (as in Polysiphonia).
Why is Batrachospermum red algae?
Batrachospermum, genus of freshwater red algae (family Batrachospermaceae) ranging in colour from violet to blue-green. The long, branched, threadlike filaments bear dense whorls of branchlets, resembling beads on a string.
Is Rhodophyta photosynthetic?
Rhodophyta rōdŏf´ətə [key], phylum (division) of the kingdom Protista consisting of the photosynthetic organisms commonly known as red algae. Most of the world’s seaweeds belong to this group.
What are the characteristics of Batrachospermum?
Batrachospermum is composed of gelatinous gametophyte filaments, up to 40 cm long, with beaded appearance, varying from blue-green, olive, violet, gray to brownish. It contains a uniaxial central axis with large cylindrical cells; four to six pericentral cells produce repeatedly branched fascicles of limited growth.
What is the meaning of Batrachospermum?
Definition of Batrachospermum : a genus (the type of the family Batrachospermaceae) of red algae of the order Nemalionales found in slow-moving fresh waters and having a thallus that consists of a conspicuous central axis bearing transverse whorls of short branches at regular intervals.
Is tetraspores haploid or diploid?
haploid spores
Tetraspore – one of four haploid spores produced meiotically in a tetrasporangium in red algae that develops into a gametophyte. Tetrasporophyte – red alga in free-living, diploid stage of the life cycle that produces tetraspores by meiosis; carpospores develop into tetrasporophytes.
What is a cystocarp?
A cystocarp is the fruiting structure produced in the red algae after fertilization, especially such a structure having a special protective envelope (as in Polysiphonia). The structure from which carpospores are released.
Is cystocarp haploid or diploid?
The zygote formed by the fusion of egg and sperm is only diploid structure. The cystocarp or the fruit body of these algae produced from the oospore, though apparently sporophytic, is haploid because during its formation the zygote nucleus undergoes reduction division.
Is there any alternation of gametophytic and sporophytic generations in algae?
In these lower red algae, there is a definite alternation of haploid to diploid number of chromosomes and back to haploid. In these cases, there is no alternation of gametophytic and sporophytic generations with different functions. Such life-cycle is triphasic, possessing three phases, e. g., Batrachospermum plant, cystocarp and zygote.
How are the daughter nuclei distributed in the cystocarp?
The two daughter cells extend laterally and ultimately fuse with the adjacent auxiliary cells, and thus the two diploid daughter nuclei are distributed in the auxiliary cells (Fig. 125H to J). Ultimately the two auxiliary cells give rise to two gonimoblasts of the cystocarp. Cystocarps are usually developed in pairs.