What is structure of Vaucheria?
Vaucheria thallus is haploid. It is aseptate, branched, tubular and coenocytic structure. Vegetative re-production takes place by fragmentation. Asexual reproduction takes place by zoospore in aquatic species and by aplanospores in terrestrial species.
What fungal characteristics are seen in Vaucheria?
Vaucheria species are characterized by multinucleate tubular branches that lack cross walls except when associated with reproductive organs or when injured. Food is stored as oil globules. Asexual reproduction is by motile multiflagellate zoospores and nonmotile aplanospores.
Who discovered Vaucheria?
Name derivation: After Genevan botanist Jean-Pierre-Etienne Vaucher who studied its reproduction (circa 1800). Vaucher was one of the first botanists to consider that such primitive protists (algae) used sexual reproduction. At that time Vaucheria was known as Cryptogames (online).
How many species of Vaucheria are there?
It is one of only two genera in the family Vaucheriaceae. The type species of the genus is Vaucheria disperma….
| Vaucheria | |
|---|---|
| Genus: | Vaucheria A.P. de Candolle |
| Species | |
| See text |
Which type of cells are found in Vaucheria?
Vaucheria. The filaments above have developed the beginnings of a branch, while the filament below has two long branches. Vaucheria has siphonaceous, coenocytic filaments that can form feltlike mats, earning it the nickname “water felt”. Cytokinesis does not usually follow mitosis, so the cells retain multiple nuclei.
Which type of nucleus is found in Vaucheria?
A single tubular cord comprising a nucleus along with the cytoplasm surrounding the large central vacuoles, is what we term as thallus Vauccheria. This type of structure is generally known as coenocytic. Septate is generally present in the connection of the reproductive organs.
What is the another name of Vaucheria?
Vaucheria is commonly known as “water felt”; the sparsely branched or unbranched coenocytic filaments often form feltlike mats.
Why is Vaucheria called green felt?
Vaucheria or Green Felt, is an alga which appears as a large, dense, dark-green, felted mass of coarse, tubular, branching filaments. It spreads over the mud in shallow ditches and on moist earth near springs or floating on the surface of ponds and in quiet fresh water.
Why Vaucheria is called the green felt?
Which type of flagella are found in Vaucheria?
directed flagellum is whip lash (fig. 19). in Vaucheria. The uninucleate, biflagellate spermatozoid stands markedly in contrast to the multinucleate and multiflagellate zoospore.
Why Vaucheria zoospores are called as compound zoospores?
Vaucheria has distinctive large, multinucleate zoospores with many pairs of unequal flagella. These “compound zoospores” result from incomplete cleavage during the division process that takes place in the apical portion of the filaments.
What is Gongrosira stage of Vaucheria?
Each part develops cysts or hypnospores. This stage of Vaucheria is called Gongrosira stage as it resembles the alga Gongrosira. The cyst ruptures in favourable conditions and protoplast comes out by amoeboid movement. This protoplast become spherical and secretes new wall.
What is the zoospore of Vaucheria?
(a). Zoospores. In vaucheria, asexual reproduction occurs by the large solitary zoospore, during the period of development, the apex of the filament swells up and becomes club-shaped, further, it will be separated from the rest of the filament by septum. The club-shaped body formed is called Zoosporangium.
What flagella is found in Vaucheria?
What are the characteristics of sexual reproduction in algae?
• Sexual reproduction – isogamous, anisogamous and oogamous • Zygote develops a thick wall to form an oospore • Life cycle – isomorphic or heteromorphic • Life cycle – haplontic, diplontic, diplohaplontic, haplobiontic and diplobiontic • Alternation of generations is common in algae 7.
What is edaphic algae?
Edaphic algae • Algae which are living in or on the moist soils • It is also called edaphophytes or terrestrial algae • Some sps. live in the suface of soil where organic matter is abundant – saprophytes epiterranean. Eg. Vaucheria • Algae which live bolow the soil surface – cryptophytes [subterranean].
What are the characteristics of yellow-green algae?
The yellow-green algae are a group of heterokonts composed primarily of freshwater forms and a few marine representatives. Many species are single-celled organisms, whereas others are colonial, living as naked cells in a gelatinous envelope, or produce long filaments of cells.
How many classes of algae were proposed by Fritsch?
He divided it into 11 classes. His classification of algae is mainly based upon characters of pigments, flagella and reserve food material. 14. • Eleven classes proposed by Fritsch are as follows: • 1.