Chlorella
Sub- division Algae
Class Chlorophyceae
Order Chlorococcales
Family Chlorellaceae
Genus Chlorella
Practical work and study
A Single cell representing a thallus.
Place a few cells on a slide, stain with safranin, wash in water and
mount in glycerine. Study the cell structure.
1.Single cell represents the thallus. The cell is
non-motile.
2. The cell mostly occur singly or sometimes in groups.
3. A cell is very small. It is spherical to ellipsoidal in shape.
4. A cell has a single cup-shaped or curved band of chloroplast,
parietal in position.
5. A single pyrenoid is generally found (lacking at times).
6. Nucleus lies surrounded by the cytoplasm which fills up most of the
cell.
7. The only method of reproduction is by autospores. Two to sixteen autospores
are formed by the cell as a result of division.
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Identification
Sub-division—Algae.
(1) Simple thallus.
(2) Presence of chlorophyll.
(3)
Cell wall of cellulose.
Class—Chiorophyceae.
(1) Chloroplasts grass-green,
(2) Photosynthetic reserve—starch.
Order—Chliorococcales,
(1) Cells single and non-motile,
(2) Uninucleate cells,
(3) Method of reproduction—zoospores or autospore
formation.
Family—Chlorellaceae.
(1) Cell single, if united do not form a definite
colony,
(2) Reproduction by autospores.
Genus—Chlorella,
(1) Cells solitary and spherical with smooth walls,
(2) Single
chloroplast.
Hints for collection
It is found free living in quite and running waters. It also grows
within the cells or tissues of invertebrates. C. Parasitica (Zoochlorella)
is found in Ophrypodium spongilla etc. C. conductrix is known to occur in
Hydra, Paramecium and Stentor.
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